Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ChemTech (Organic Chem) > Preparation of Nitro Compounds > Flashcards

Preparation of Nitro Compounds Flashcards

You may prefer our related Brainscape-certified flashcards:
Chemistry 101 flashcards AP® Chemistry flashcards Periodic Table flashcards Organic Chemistry 101 flashcards
1
Q
  1. Which of the following is used as a reactant for the
    nitration of benzene to form nitrobenzene?
    a) HNO2
    b) HNO3
    c) Mixture of HNO2 AND HNO3
    d) Mixture of HNO2 and H2SO4
A

c) Mixture of HNO2 AND HNO3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. In Ter Meer reaction, a method of preparation of nitro
    compound, which of the following used as reagent?
    a) HNO2
    b) HNO3
    c) NaNO2
    d) RX (alkyl halide)
A

c) NaNO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. What will be the product if 1,1-halonitroalkane
    undergoes nucleophilic aliphatic substitution reaction in
    presence of ethanol?
    a) 1,1-dinitro dimer
    b) 1,2-dinitro dimer
    c) 1.-nitro compound
    d) 2-nitrocompound
A

a) 1,1-dinitro dimer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. What will be the product if 1,1-halonitroalkane
    undergoes nucleophilic aliphatic substitution reaction in
    presence of potassiam hydroxide?
    a) 1,1-dinitro dimer
    b) 1,2-dinitro dimer
    c) 1.-nitro compound
    d) 2-nitrocompound
A

b) 1,2-dinitro dimer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. Which of the following is not a natural occurring nitro
    compound?
    a) Chloramphenicol
    b) 2-Nitrophenol
    c) 3-Nitropropionic acid
    d) nitrobenzene
A

d) nitrobenzene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. Which combination of reagents used in the indicated
    order with benzene will give m-nitropropylbenzene?
    a) 1) HNO3/H2SO4, 2) CH3CH2CH2Cl/AlCl3
    b) 1) CH3CH2CH2Cl/AlCl3, 2) HNO3/H2SO4
    c) 1) CH3CH2COCl/AlCl3, 2) HNO3/H2SO4, 3) H2NNH2/NaOH
    d) 1) HNO3/H2SO4, 2) CH3CH2COCl/AlCl3, 3) H2NNH2/NaOH
A

d) 1) HNO3/H2SO4, 2) CH3CH2COCl/AlCl3, 3) H2NNH2/NaOH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. Nitration of furan using acetyl nitrate also leads to a 2,5
    addition product. How can this competing process be
    suppressed?
    a) By using concentrated nitric and sulfuric acids instead of
    acetyl nitrate
    b) By carrying out the reaction at higher temperatures
    c) By carrying out the nitration in the presence of pyridine
    d) By using nitric acid instead of acetyl nitrate
A

c) By carrying out the nitration in the presence of pyridine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. The phenomenon or process by which imine are
    converted into enamine is which of the following?
    a) Imination
    b) Enamination
    c) Amination
    d) Tautomerism
A

d) Tautomerism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. Which of the following is not true about enamines?
    a) Enamine are derived by the condensation of an
    aldehyde or ketone with a primary amine
    b) Enamines are versatile intermediates
    c) Enamines are considered to be nitrogen analogs of enols
    d) They are tautomeric form of imine
A

a) Enamine are derived by the condensation of an

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. Enamine shows which type of behavior?
    a) Basic
    b) Electrophilic and acidic
    c) Nucleophilic and basic
    d) Nucleophilic
A

c) Nucleophilic and basic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. What is the name of the compound formed when
    alkylation of enamine is followed by hydrolysis?
    a) Carboxylic acid
    b) Ketone
    c) Amide
    d) ester
A

b) Ketone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. Which cyclic ketone enamine is most reactive?
    a) Five membered
    b) Six membered
    c) Seven membered
    d) Eight membered
A

a) Five membered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. Compounds which have different arrangements of
    atoms in space while having same atoms bonded to each
    other are said to have
    a) position isomerism
    b) functional group isomerism
    c) chain isomerism
    d) stereoisomerism
A

d) stereoisomerism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. Which of the following can make difference in optical
    isomers?
    a) heat
    b) temperature
    c) polarized light
    d) pressur
A

c) polarized light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. Which of the following is an alkane which can exhibit
    optical activity?
    a) Neopentane
    b) Isopentane
    c) 3–Methylpentane
    d) 3–Methylhexane
A

d) 3–Methylhexane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. What is the molecular formula for the alkane of smallest
    molecular weight which possesses a stereogenic center?
    a) C4H10
    b) C5H12
    c) C6H14
    d) C7H16
A

d) C7H16

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  1. Which of the following statements most accurately
    describes the stereochemistry between the various
    cyclohexanes?
    a) Cis-1,2-dichlorocyclohexane and trans-1,2
    dichlorocyclohexane rotate plane-polarized light in
    opposite directions, and together in equal proportions
    form a racemic mixture
    b) The diaxial and diequatorial forms of trans-1,3
    dichlorohexane can be separated by their differing
    physical properties
    c) Only cis-1,4-dichlorocyclohexane is achiral due to a
    plane of symmetry, and cis-1,4-dichlorocyclohexane is
    diastereomeric to trans-1,4-dichlorocyclohexane
    d) The conformational isomers of trans-1,2
    dichlorocyclohexane are enantiomers, which are not
    interconvertible, but resolvable
A

d) The conformational isomers of trans-1,2
dichlorocyclohexane are enantiomers, which are not
interconvertible, but resolvable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q
  1. How many stereoisomers of 3-bromo-2-butanol,
    CH3CH(OH)CHBrCH3, exist?
    a) 3
    b) 1
    c) 2
    d) 4
A

d) 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q
  1. How many stereoisomers of 2,3-butanediol,
    CH3CH(OH)CH(OH)CH3, exist?
    a) 3
    b) 4
    c) 1
    d) 2
A

a) 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q
  1. Which of the following compounds can exhibit
    geometrical isomerism?
    a) 1-Hexene
    b) 2-Methyl-2-Pentene
    c) 3-methyl-1-pentene
    d) 2-Hexene
A

d) 2-Hexene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q
  1. How many number of stereoisomers possible for 2, 3
    pentanediol?
    a) 3
    b) 4
    c) 5
    d) 6
A

b) 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q
  1. How many chiral stereoisomers can be drawn for
    CH3CHFCHFCH(CH3)2?
    a) 4
    b) 5
    c) 6
    d) 7
A

a) 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q
  1. What is the total number of isomers, stereoisomers
    included, designated by the dichlorocyclopentane?
    a) 7
    b) 6
    c) 4
    d) 5
A

a) 7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q
  1. What does a polarimeter measure?
    a) Polarity of the substance
    b) Angle of rotation of an optical active compound
    c) Concentration of the substance
    d) pH of the substance
A

b) Angle of rotation of an optical active compound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q
  1. A solution of 0.1 g/mL of a pure R enantiomer in a 1.0
    dm (i.e., 10 cm) polarimeter rotates plane polarized light
    by +4.8°. What is the rotation observed on this solution in
    a 2 dm polarimeter?
    a) +2.4°
    b) +4.8°
    c) +19°
    d) +9.6
A

d) +9.6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q
  1. Polarimeter works on the principle of which of the
    following?
    a) polarisation of light
    b) change of the electrical conductivity of solution with
    composition
    c) change of angle of refraction with composition
    d) change of electrical conductivity of solution with
    temperature
A

a) polarisation of light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
  1. What is the effect of the I on the specific optical rotation
    (α), if I gets double?
    a) α gets double
    b) α gets halved
    c) α gets four times
    d) α eight times
A

a) α gets double

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
  1. If a solution of a compound (30.0 g/100 mL of solution)
    has a measured rotation of +15° in a 2 dm tube, what is
    the specific rotation?
    a) +50°
    b) +25°
    c) +15°
    d) +7.5°
A

b) +25°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q
  1. Which of the following groups has the highest priority
    according to the Cahn-Ingold-Prelog sequence rules?
    a) CH3
    b) CH2Cl
    c) CH2OH
    d) CHO
A

b) CH2Cl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q
  1. What is the percent composition of a mixture of (S)-(+)
    2-butanol, α= +13.52°, and (R)-(-)-2-butanol, α = -13.52°,
    with a specific rotation α = +6.76°?
    a) 75%(R) 25%(S)
    b) 25%(R) 75%(S)
    c) 50%(R) 50%(S)
    d) 67%(R) 33%(S)
A

b) 25%(R) 75%(S)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q
  1. What can be said with certainty if a compound has α=
    9.25°?
    a) The compound has the (S) configuration
    b) The compound has the (R) configuration
    c) The compound is not a meso form
    d) The compound possesses only one stereogenic center
A

c) The compound is not a meso form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q
  1. Which of these is a comparatively insignificant factor
    affecting the magnitude of specific optical rotation?
    a) Concentration of the substance of interest
    b) Purity of the sample
    c) Temperature of the measurement
    d) Length of the sample tube
A

c) Temperature of the measurement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q
  1. What is the specific optical rotation of (S)-malic acid at
    a concentration of 5.5 g/ mL in the solvent pyridine at 20°C
    at a wavelength of 589 nm?
    a) the specific rotation is –27°
    b) the specific rotation is +27°
    c) the specific rotation is –17°
    d) the specific rotation is +17
A

a) the specific rotation is –27°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q
  1. Which of the following is the definition for
    enatiomerism?
    a) A pair of stereoisomers each of which has two chirality
    centres
    b) A pair of stereoisomers that are not mirror images of
    one another
    c) A pair of stereoisomers that are non-superimposable
    mirror images of one another
    d) Any pair of stereoisomers
A

c) A pair of stereoisomers that are non-superimposable
mirror images of one another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q
  1. Which of the following statements is not true regarding
    pairs of enantiomers?
    a) They have identical boiling points
    b) They rotate plane polarized light in opposite directions
    c) They react at identical rates with chiral reagents
    d) They have identical melting points
A

b) They rotate plane polarized light in opposite directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q
  1. Which of the following statements regarding optical
    rotation is not true?
    a) All R enantiomers are dextrorotatory
    b) All (+) enantiomers are laevorotatory
    c) All (-) enantiomers rotate plane polarized light in a
    counter clockwise direction
    d) (+) and (-) enantiomers rotate plane polarized light in
    opposite directions
A

c) All (-) enantiomers rotate plane polarized light in a
counter clockwise direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q
  1. Which of the following notations is not used to
    distinguish between pairs of enantiomers?
    a) R and S
    b) E and Z
    c) + and –
    d) D and L
A

b) E and Z

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q
  1. Which among the following is true about
    enantiomerism?
    a) Assignments of R and S labels and (+) and (–) labels are
    not connected
    b) The labels R and S refer to different conformers
    c) The labels (+) and (–) are used to distinguish
    enantiomers
    d) The specific rotation of enantiomers is equal and
    opposite
A

b) The labels R and S refer to different conformers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q
  1. Which of the following molecules does not possess
    enantiomers?
    a) CH3CH2CH2CHBrCH3
    b) CH3CH2CBr2CH3
    c) CH3CHBrCH2CH3
    d) CHBr2CH2CHBrCH3
A

b) CH3CH2CBr2CH3

40
Q
  1. Which of the following is true of any (S)-enantiomerism?
    a) It rotates plane-polarized light to the right
    b) It rotates plane-polarized light to the left
    c) It is a racemic form
    d) It is the mirror image of the corresponding (R)
    enantiomer
A

d) It is the mirror image of the corresponding (R)
enantiomer

41
Q
  1. Which of the following is not true of enantiomers? They
    have the same:
    a) boiling point
    b) melting point
    c) specific rotation
    d) density
A

c) specific rotation

42
Q
  1. In the absence of specific data, it can only be said that
    (R)–2–bromopentane is which of the following?
    a) dextrorotatory (+)
    b) levorotatory (–)
    c) optically inactive
    d) analogous in absolute configuration to (R)–2
    chloropentane
A

d) analogous in absolute configuration to (R)–2
chloropentane

43
Q
  1. Which statement about a chiral compound A is
    incorrect?
    a) A racemate contains equal amounts of (+)-A and (–)-A
    b) If A is resolved, it is separated into its enantiomers
    c) (+)-A can also be labelled R-A, because (+) means the
    same as R
    d) (+)-A and (–)-A will rotate polarized light equally but in
    opposite directions
A

c) (+)-A can also be labelled R-A, because (+) means the
same as R

44
Q
  1. Which of the following is the definition of chirality?
    a) The superimposability of an object on its mirror image
    b) A molecule with a mirror image
    c) The non-superimposability an object on its mirror image
    d) A molecule that has a carbon atom with four different
    substituents
A

c) The non-superimposability an object on its mirror image

45
Q
  1. Which of the following statements regarding
    enantiomers not true?
    a) All (+) enantiomers are levorotatory
    b) All (-) enantiomers rotate plane polarized light in a
    counterclockwise direction
    c) (+) and (-) enantiomers rotate plane polarized light in
    opposite directions
    d) All R enantiomers are dextrorotatory
A

d) All R enantiomers are dextrorotatory

46
Q
  1. Which of the following is true of any (S)-enantiomer?
    a) It rotates plane-polarized light to the right
    b) It rotates plane-polarized light to the left
    c) It is a racemic form
    d) It is the mirror image of the corresponding (R)
    enantiomer
A

d) It is the mirror image of the corresponding (R)
enantiomer

47
Q
  1. Which of the following molecules exists as a pair of
    enantiomers?
    a) 2-Bromopropane
    b) 1-Bromo-3-methylbutane
    c) 2-Cyclohexen-1-ol
    d) cis-1,2-Dichlorocyclobutane
A

c) 2-Cyclohexen-1-ol

48
Q
  1. Which of the following diols exists as a pair of
    enantiomers?
    a) cis-1,3-Cyclohexanediol
    b) trans-1,3-Cyclohexanediol
    c) cis-1,4-Cyclohexanediol
    d) trans-1,4-Cyclohexanediol
A

b) trans-1,3-Cyclohexanediol

49
Q
  1. Which of the following is capable of existing as a pair
    of enantiomers?
    a) 2-methylpropane
    b) 2-methylpentane
    c) 3-methylpentane
    d) 3-methylhexane
A

d) 3-methylhexane

50
Q
  1. Which of the following is the definition of a pair of
    diastereomers?
    a) A pair of stereoisomers each of which has two chirality
    centers
    b) Any pair of stereoisomers
    c) A pair of stereoisomers that are not mirror images of
    one another
    d) A pair of stereoisomers that are non-superimposable
    mirror images of one another
A

c) A pair of stereoisomers that are not mirror images of
one another

51
Q
  1. Which of the following can exist as diastereomers?
    a) Lactic acid
    b) 1-Butene
    c) 2-Butene
    d) Ethane
A

c) 2-Butene

52
Q
  1. Which of the following compounds would be suitable
    for preparing the necessary diastereomeric salts in
    preparation of Naproxen?
    a) Quinoline
    b) Tartaric acid
    c) Malic acid
    d) Cinchonidine
A

d) Cinchonidine

53
Q
  1. Which of the following is the definition of a meso
    compound?
    a) A molecule with chirality centers which is chiral
    b) A chiral compound with more than one chirality center
    c) A diastereomer with no chirality centers
    d) A molecule with chirality centers which is not chiral
    View Answer
A

d) A molecule with chirality centers which is not chiral
View Answer

54
Q
  1. A compound whose molecules are superimposable on
    their mirror images even though they contain asymmetric
    carbon atoms is called
    a) A threo compound
    b) A meso compound
    c) A unsymmetric compound
    d) An erythro compound
A

b) A meso compound

55
Q
  1. Which of the following compounds is a meso
    compound?
    a) (2R,3R)-dibromobutane
    b) (2R,3S)-dibromobutane
    c) (2R,3S)-3-bromo-2-butanol
    d) (2R,3R)-3-bromo-2-butanol
A

b) (2R,3S)-dibromobutane

56
Q
  1. Which statement is not true for a meso compound?
    a) The specific rotation is 0°
    b) There are one or more planes of symmetry
    c) A single molecule is identical to its mirror image
    d) The stereochemical labels, (R) and (S), must be identical
    for each stereogenic center
A

d) The stereochemical labels, (R) and (S), must be identical
for each stereogenic center

57
Q
  1. Which is a meso compound?
    a) (2R,3R)-2,3-Dibromobutane
    b) (2R,3S)-2,3-Dibromopentane
    c) (2R,4R)-2,4-Dibromopentane
    d) (2R,4S)-2,4-Dibromopentane
A
58
Q
  1. Which of the following is not true about the five
    membered rings?
    a) Five membered rings are more stable than 4 membered
    rings
    b) Five membered rings are more stable than 6 membered
    rings
    c) Five membered rings are more stable than 7 membered
    rings
    d) Five membered rings are more stable than 8 membered
    rings
A

b) Five membered rings are more stable than 6 membered
rings

59
Q
  1. Which of the following is a not a five membered ring?
    a) Pyridine
    b) Pyrrole
    c) Furan
    d) Thiophene
A

a) Pyridine

60
Q
  1. Which of the following five membered rings is most
    resonance stabilized?
    a) Furan
    b) Thiophene
    c) Pyrrole
    d) Pyridine
A

b) Thiophene

61
Q
  1. Five membered rings come under which category of
    heterocycle classification on the basis of chemical
    behavior?
    a) -excessive heterocycle
    b) -deficient heterocycle
    c) -equivalent heterocycle
    d) Can’t say about the five membered rings
A

a) -excessive heterocycle

62
Q
  1. What is the reactivity order in the following five
    membered heterocyclic compounds?
    a) Pyrrole
    b) Furan
    c) Thiophene
    d) Pyridine
A

a) Pyrrole

63
Q
  1. What is the product when thiophene reacts with Br2 in
    benzene?
    a) 2-bromothiophene
    b) 3-bromothiophene
    c) 2,5-dibromothiophene
    d) 3,4-dibromothiophene
A

c) 2,5-dibromothiophene

64
Q
  1. What is the product when pyrrole reacts with Br2 in
    ethanol?
    a) 2,3-dibromopyrrole
    b) 2,3,4,5-tetrabromopyrrole
    c) 2,5-dibromopyrrole
    d) 3,4-dibromopyrrole
A

b) 2,3,4,5-tetrabromopyrrole

65
Q
  1. Pyridine is a which type of heterocyclic compound from
    the following options?
    a) Six membered heterocyclic compound
    b) Seven membered heterocyclic compound
    c) Four membered heterocyclic compound
    d) Five membered heterocyclic compound
A

a) Six membered heterocyclic compound

66
Q
  1. Which element is present as hetero atom in pyridine?
    a) Sulphur
    b) Nitrogen
    c) Oxygen
    d) Sulphur and nitrogen
A

b) Nitroge

67
Q
  1. The electron of Nitrogen participating in the resonance
    in pyridine is present in which orbital?
    a) p-orbital
    b) sp2-orbital
    c) sp3-orbital
    d) sp -orbital
A

b) sp2-orbital

68
Q
  1. Pyridine is a not a planner compound?
    a) True
    b) False
A

b) False

69
Q
  1. How many number of resonating structure stabilises a
    pyridine molecule?
    a) 4
    b) 5
    c) 6
    d) 7
A

b) 5

70
Q
  1. Pyridine come under which category of heterocycle
    classification on the basis of chemical behavior?
    a) -excessive heterocycle
    b) -deficient heterocycle
    c) -equivalent heterocycle
    d) can’t say about the five membered rings
A

b) -deficient heterocycle

71
Q
  1. What is the smallest angle in pyridine ring?
    a) 116.7°
    b) 115.0°
    c) 124.0°
    d) 118.1°
A

a) 116.7°

72
Q
  1. What is the dipole moment of the pyridine?
    a) Zero
    b) 2.2 D
    c) 1.17 D
    d) 4.3 D
A

b) 2.2 D

73
Q
  1. Which of the following is the correct range for the bond
    length in the pyridine molecule?
    a) 1.34 – 1.40 A°
    b) 1.24 – 1.32 A°
    c) 2.4 – 2.49 A°
    d) 1.02 – 1.17 A°
A

a) 1.34 – 1.40 A°

74
Q
  1. What is the greatest angle in pyridine ring?
    a) 116°
    b) 140°
    c) 124°
    d) 118°
A

c) 124°

75
Q
  1. Which of the following plant is the natural source of
    pyridine?
    a) Atropa belladonna
    b) Ocimum tenuiflorum
    c) Azadirachta indica
    d) Ficus religiose
A

a) Atropa belladonna

76
Q
  1. Why is extraction of pyridine from coal tar or as a
    byproduct of coal gasification ineffective?
    a) Less concentration of desired compound
    b) This method is expensive
    c) Reactive is rare
    d) Dangerous procedure
A

a) Less concentration of desired compound

77
Q
  1. Which of the following derivative of pyridine is mostly
    found in mycobacterium tuberculosis?
    a) Niacin
    b) Nicotinamide
    c) Nicotinic acid
    d) Strychnine
A

c) Nicotinic acid

78
Q
  1. Mycobacterium tuberculosis and Escherichia coli
    produce nicotinic acid by condensation of which of the
    following compounds?
    a) Glyceraldehyde 3-phosphate
    b) Amino acid
    c) Pyrrole
    d) acetylene
A

c) Pyrrole

79
Q
  1. Which of the following derivative of pyridine is mostly
    found in mammals?
    a) Nicotinamide
    b) Vitamin B6
    c) Nicotinic acid
    d) Strychnine
A

c) Nicotinic acid

80
Q
  1. Mycobacterium tuberculosis and Escherichia coli
    produce nicotinic acid by condensation of which of the
    following compounds?
    a) Glyceraldehyde 3-phosphate
    b) Kynurenine
    c) Pyrrole
    d) Tryptophan
A

c) Pyrrole

81
Q
  1. In the synthesis of pyridine by Chichibabin synthesis,
    synthesis of acroloien is done which method?
    a) Knoevenagel Condensation
    b) Aldol condensation
    c) Dieckmann condensation
    d) Claisen condensation
A

a) Knoevenagel Condensation

82
Q
  1. Which of the following reagent can’t be used as the
    reagent in the dealkylation of alkylpyridines in the pyridine
    synthesis?
    a) Vanadium oxide
    b) Nickel based catalyst
    c) Silver or platinum-based catalyst
    d) Copper catalyst
A

d) Copper catalyst

83
Q
  1. Which of the following catalyst can be used in the
    synthesis of pyridine by Bönnemann cyclization?
    a) Vanadium oxide
    b) Nickel based catalyst
    c) Silver or platinum-based catalyst
    d) Cobalt catalyst
A

d) Cobalt catalyst

84
Q
  1. Electrophilic substitution reaction of pyridine is most
    effective in which of the conditions?
    a) In slightly acidic conditions
    b) In slightly basic conditions
    c) In neutral medium
    d) In vigorous conditions
A

d) In vigorous conditions

85
Q
  1. Which of the following electrophilic substitution
    reaction is not possible in pyridine?
    a) Nitration
    b) Sulphonation
    c) Bromination
    d) Friedel craft reaction
A

d) Friedel craft reaction

86
Q
  1. At which position of pyridine electrophilic substitution
    reaction is most preferred?
    a) First
    b) Second
    c) Third
    d) Forth
A

c) Third

87
Q
  1. At which position of pyridine nucleophilic substitution
    reaction is most preferred?
    a) First and third
    b) Second
    c) Third
    d) Second and Forth
A

d) Second and Forth

88
Q
  1. Pyridine undergoes nucleophilic substitution with
    NaNH2 at 100℃ to give which of the following?
    a) 3-aminopyridine
    b) 2-aminopyridine
    c) 3,5-diaminopyridine
    d) 2,5-diaminopyridine
A

b) 2-aminopyridin

89
Q
  1. Pyridine undergoes nucleophilic substitution with excess
    of NaNH2 at 100℃ to give which of the following?
    a) 3-aminopyridine
    b) 2,6-diaminopyridine
    c) 3,5-diaminopyridine
    d) 2,5-diaminopyridine
A

b) 2,6-diaminopyridine

90
Q
  1. Nucleophilic substitution reaction of pyridine is most
    effective in which of the conditions?
    a) In slightly acidic conditions
    b) In slightly basic conditions
    c) In neutral medium
    d) No specific condition requirements
A

d) No specific condition requirements

91
Q
  1. Electron-withdrawing groups inhibit the Chichibabin
    reaction. Which of the following statement is not true
    about this fact?
    a) they increase the basicity of the ring nitrogen
    b) these electron-withdrawing groups can also form
    complexes with sodium amide
    c) for single electron transfer pathway, altering the
    distribution of spin density of the intermediate radical
    anion
    d) they slow down the sorption on sodium amide
A

a) they increase the basicity of the ring nitrogen

92
Q
  1. What will be the product if reaction with hydrogen gas
    in the presence of Raney nickel takes place?
    a) Pyrimidine
    b) Piperdine
    c) Pyrylium salt
    d) Pentazine
A

a) Pyrimidine

93
Q
  1. What is name of the reaction when piperdine is
    converted by pyridine commercially?
    a) Dehydrogenation
    b) Hydrogenation
    c) Hydrogenolysis
    d) Transfer hydrogenation
A

b) Hydrogenation

94
Q
  1. By which of the following agent there will be incomplete
    reduction of pyridine?
    a) Na-NH2, EtOH
    b) H2/RaNi, 200℃
    c) Na/C2H5OH
    d) NaBH3
A

a) Na-NH2, EtOH

95
Q
  1. When Lithiumtetrahydroborate in the presence of water
    reacts with pyridine, which product is formed?
    a) Piperidine
    b) 1,4-dihydropyridine
    c) 1,2-dihydropyridine
    d) 2,5-dihydropyridine
A

b) 1,4-dihydropyridine

96
Q
  1. When lithium aluminium hydride reacts with pyridine,
    which product is not formed?
    a) Piperidine
    b) 1,4-dihydropyridine
    c) 1,2-dihydropyridine
    d) 2,5-dihydropyridine
A

a) Piperidine

97
Q
  1. Pyridine undergoes nucleophilic substitution with
    phenyl lithium at 100℃ to give which of the following?
    a) 3-phenylpyridine
    b) 2-phenylpyridine
    c) 3,5-diphenylpyridine
    d) 2,5-diaphenylpyridine
A

b) 2-phenylpyridine

ChemTech (Organic Chem) (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions