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Classification of Organic Compounds Flashcards

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1
Q
  1. Organic compounds are broadly classified as
    a) Open chain compounds and acyclic compounds
    b) Open chain compounds and linear chain compounds
    c) Cyclic compounds and alicyclic compounds
    d) alicyclic compounds and acyclic compounds
A

d) alicyclic compounds and acyclic compounds

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2
Q
  1. Aliphatic compound is the other name for
    a) Acyclic compounds
    b) Alicyclic compounds
    c) Ring compounds
    d) Closed chain compounds
A

a) Acyclic compounds

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3
Q
  1. Which among the following is not an example of Acyclic compound
    a) Acetaldehyde
    b) Ethane
    c) Cyclopropane
    d) Isobutane
A

c) Cyclopropane

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4
Q
  1. Which among the following is not an example of alicyclic
    compound
    a) Cyclohexane
    b) Cyclohexene
    c) Tetrahydrofuran
    d) Acetic acid
A

d) Acetic acid

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5
Q
  1. Which among the following is not a class of organic
    compound
    a) Carbonyl compound
    b) Nitro compound
    c) Amides
    d) Electro compounds
A

d) Electro compounds

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5
Q
  1. Which among the following is not an aromatic
    compound(in specific)
    a) Naphthalene
    b) Aniline
    c) Pyridine
    d) Tropolone
A

c) Pyridine

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5
Q
  1. Identify the odd one among the following
    a) Indene
    b) Anthracene
    c) o,m,p-xylene
    d) Azulene
A

d) Azulene

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6
Q
  1. Organic compounds can be classified even based upon the function groups. Identify the one which is not a functional group
    a) Isocyanide
    b) Isocyano
    c) Carboxyl
    d) Carbonyl
A

a functional group

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7
Q
  1. Find the odd one among the following:
    a) Alicyclic compounds
    b) Heterogeneous compounds
    c) Branched chain compounds
    d) Aromatic compounds
A

c) Branched chain compounds

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8
Q
  1. Resonance forms are in equilibrium with each other.
    State true or false
    a) True
    b) False
A

b) False

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8
Q
  1. Identify the false statement regarding resonance
    a) As the number of charges increases, the resonance
    forms gets more significant
    b) Zero charge of resonance is the most significant one
    c) Atoms with full octet resonance form are more stable
    when compared with the one with unfilled octet
    d) Resonance is unstable in case of unfilled octet of
    nitrogen atom
A

a) As the number of charges increases, the resonance
forms gets more significant

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9
Q
  1. Which among these is not associated with aliphatic
    compounds
    a) They contain (4n+2)pi electrons
    b) Contain straight chain compounds
    c) Contain branched chain compounds
    d) Has appropriate number of H-atoms and functional
A

a) They contain (4n+2)pi electrons

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10
Q
  1. Identify the correct sequence according to
    electronegativity
    a) F> NH2> CH3>OH b) NH2> F>CH3> OH c) NH2>OH> CH3>F d) F> OH>NH2>CH3`
A

d) F> OH>NH2>CH3

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11
Q
  1. Identify the correct sequence with respect to Inductive
    effects
    a) CF3> CH2F> CHF2> CF3
    b) CF3> CHF2> CH2F> CH3
    c) CH3> CH2F> CHF2> CF3
    d) CH3> CHF2> CH2Fv CF3
A

b) CF3> CHF2> CH2F> CH3

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11
Q
  1. Select the correct statement regarding the aromatic
    nitrogen molecule
    a) It is not hybridized
    b) It is sp hybridized
    c) It is sp2 hybridized
    d) It is sp3 hybridized
A

c) It is sp2 hybridized

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12
Q
  1. Stability sequence: primary carbocation> secondary
    carbocation > tertiary carbocation.
    Is this sequence correct?
    a) Yes
    b) No
A

b) No

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12
Q
  1. Identify the incorrect statement regarding aromaticity
    a) It is the extra stability possessed by a molecule
    b) p-orbitals must be planar and overlap
    c) Cyclic delocalization takes place
    d) It does not follow Huckel’s rule
A

d) It does not follow Huckel’s rule

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13
Q
  1. Can a linear molecule have aromaticity?
    a) Yes
    b) No
A

a) Yes

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13
Q
  1. Identify the one which does not come under the organic addition reaction
    a) Hydration
    b) Dehydration
    c) Halogenation
    d) Hydrohalogenation
A

b) Dehydration

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14
Q
  1. Select the incorrect statement:
    a) A resonance may sometimes cause sp3 atoms to
    become sp2 hybridized
    b) Delocalizing one lone pair causes aromaticity
    c) One lone pair will be counted as two pi electrons
    according to Huckel’s equation
    d) Two sigma bonds make up a double bond
A

d) Two sigma bonds make up a double bond

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14
Q
  1. Aromatic rings do not have resonance structures. State true or false
    a) False
    b) True
A

a) False

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15
Q
  1. Choose the correct one which will react faster in the
    SN2 nucleophilic substitution reaction
    a) CH2-CH=CH2=Br
    b) CH2 = CH- CH2 – Br
    c) CH2 = CH- CH2 = Br
    d) CH= CH2 – CH2 – Br
A

b) CH2 = CH- CH2 – Br

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16
Q
  1. Identify the one which on reaction with carboxylic acid at high temperature gives Ester
    a) Ketone
    b) Alcohol
    c) Aldehyde
    d) Sugars
A

b) Alcohol

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17
Q
  1. Alcohol on refluxing with Cr2O7 gives:
    a) Ester
    b) Aldehyde
    c) Sugar
    d) Carboxylic acid
A

d) Carboxylic acid

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17
Q
  1. What will be the reactivity of chlorobenzene in an
    electrophilic substitution reaction with benzene?
    a) Reacts very slowly than benzene
    b) Reacts in the same way as benzene
    c) Reacts faster than benzene
    d) Does not react with benzene
A

a) Reacts very slowly than benzene

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18
Q
  1. Primary alcohols undergo what reaction to form
    alkenes?
    a) Elimination
    b) Oxidation
    c) Reduction
    d) Hydrolysis
A

a) Elimination

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18
Q
  1. Alkene under high temperature and high-pressure forms
    a) Alcohol
    b) Polyalkyne
    c) Polyalkane
    d) Polyalkene
A

c) Polyalkane

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19
Q
  1. Select the correct statement regarding carboxylic acids
    a) They form acyl chlorides on reaction with PCl5
    b) Aldehydes in the presence of H+/ Cr2O7 forms
    carboxylic acids
    c) They combine with alcohols to form esters
    d) Upon polymerization, they form polymers
A

d) Upon polymerization, they form polymers

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20
Q
  1. Primary amides get converted into primary amines by:
    a) Addition
    b) Oxidation
    c) Reduction
    d) Acylation
A

b) Oxidation

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20
Q
  1. Identify the one which does not come under the
    chemical methods of quantitative analysis
    a) Gravimetric
    b) Titrimetric
    c) Volumetric
    d) Magnetic suceptibility
A

d) Magnetic suceptibility

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20
Q
  1. Carbonyl compounds especially ketones undergo
    reduction to form
    a) Primary alcohols
    b) Secondary alcohols
    c) Alkanes
    d) Alkenes
A

b) Secondary alcohols

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21
Q
  1. Quantitative analysis is one which is used for separating out the specific constituents from a mixture. This
    statement is:
    a) True
    b) False
A

b) False

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21
Q
  1. Select the incorrect statement regarding analytical
    balance
    a) It is the fundamental kit in quantitative analysis
    b) It measures samples very accurately
    c) It could measure the difference in mass upto 0.1 mg
    d) It is not a sensitive instrument
A

d) It is not a sensitive instrument

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22
Q
  1. Identify the test which is not a part of qualitative
    analysis:
    a) Litmus test
    b) Kastle-Meyer test
    c) Iodine test
    d) Flame test
A

a) Litmus test

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22
Q
  1. Select the inappropriate statement regarding
    quantitative analysis
    a) It helps in determining the outcome of the product
    b) It helps in determining the impurities in the sample
    c) It fails to indicate the presence of lead in some
    compound
    d) It could identify the amounts of dosage present in the drug
A

c) It fails to indicate the presence of lead in some
compound

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23
Q
  1. Which among the following is not a physical method:
    a) X-ray fluorescence spectroscopy
    b) Atomic emission spectroscopy
    c) Inert gas fusion
    d) Trace element analysis
A

c) Inert gas fusion

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24
Q
  1. Identify the incorrect statement regarding the reagent 6M NH3
    a) It increases hydroxide and NH3 concentration
    b) It decreases H+ concentration
    c) It is capable of precipitating insoluble hydroxides
    d) It is capable of forming hydro complexes
A

d) It is capable of forming hydro complexes

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25
Q
  1. Identify the reagent which is not commonly used in
    qualitative analysis
    a) 6M NaOH
    b) 6M HCl
    c) 6M HNO3
    d) 6M NH4
A

d) 6M NH4

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25
Q
  1. Select the correct statement about the reagent 6M
    HNO3
    a) It forms hydroxo complexes
    b) It destroys hydroxo and ammonia complexes
    c) It forms NH3 complexes
    d) It decreases the H+ ion concentration
A

b) It destroys hydroxo and ammonia complexes

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25
Q
  1. Covalent molecules can be identified using quantitative methods. State true or false
    a) False
    b) True
A

a) False

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26
Q
  1. Select the incorrect statement regarding alkanes
    a) It is otherwise known as Paraffin
    b) It is an acyclic saturated hydrocarbon
    c) In alkanes, C-C bonds are single
    d) Alkanes have the general formula CnH2n
A

d) Alkanes have the general formula CnH2n

27
Q
  1. Identify the simplest alkane
    a) Methane
    b) Methene
    c) Ethane
    d) Ethene
A

a) Methane

28
Q
  1. Which among the following is not an alkane isomer with 6 carbon atoms
    a) Hexane
    b) 2,3-dimethylbutane
    c) 2,2-dimethylbutane
    d) Neopentane
A

d) Neopentane

29
Q
  1. Select the minimum number of carbon atoms, a
    molecule must possess so as to be regarded as a higher alkane
    a) 15
    b) 16
    c) 17
    d) 18
A

c) 17

30
Q
  1. Identify the incorrect statement
    a) Alkanes with repeated –CH2- units constitute a
    homologus series
    b) They are very reactive
    c) They have very less biological activity
    d) Petroleum and natural gas are the main sources of
    alkanes
A

b) They are very reactive

31
Q
  1. The other name for branched chain alkanes is
    a) Paraffins
    b) Isoparaffins
    c) Neoparaffins
    d) Naphthenes
A

b) Isoparaffins

31
Q
  1. Select the incorrect statement regarding the boiling
    points of alkanes
    a) Boiling point increases with stronger Vander Waal’s
    forces
    b) Surface area is the only factor which determines the
    boiling point of alkane
    c) Boiling point of straight chain alkanes is greater than
    that of branched chain alkanes
    d) The boiling point of cycloalkanes is always higher than that of linear alkanes
A

b) Surface area is the only factor which determines the
boiling point of alkane

32
Q
  1. Choose the correct statement :
    a) Alkanes have poor conductivity
    b) They form hydrogen bonds
    c) They have good solubility in non polar solvents than
    polar solvents
    d) Alkanes have less density than that of water
A

b) They form hydrogen bonds

33
Q
  1. Liquified petroleum gas is mainly composed of :
    a) Methane and ethane
    b) Ethane and propane
    c) Propane and butane
    d) Butane and hexane
A

c) Propane and butane

34
Q
  1. An alkane with 6 carbon atoms will have how many
    hydrogen atoms?
    a) 11
    b) 12
    c) 13
    d) 14
A

d) 14

35
Q
  1. In Alkenes the Carbon atoms are connected to each
    other by a
    a) Single bond
    b) Double bond
    c) Triple bond
    d) Not connected
A

b) Double bond

36
Q
  1. Which among these is not a structural isomer of the
    compound C4H8
    a) But-1-ene
    b) But-2-ene
    c) But-3-ene
    d) 2-methylpropene
A

c) But-3-ene

37
Q
  1. Select the incorrect statement regarding alkenes
    a) In alkenes, the carbons are connected by pi bonds
    b) Alkenes have almost same physical properties as that of the alkanes
    c) Alkenes are less reactive than alkanes
    d) Alkenes undergo polymerization reaction
A

c) Alkenes are less reactive than alkanes

38
Q
  1. Identify the addition reaction which is not undergone by the alkenes
    a) Mercuration
    b) Oxymercuration
    c) Hydroboration
    d) Halogenation
A

a) Mercuration

39
Q
  1. Which among the following is not colourless:
    a) Methene
    b) Ethene
    c) Propene
    d) Butene
A

b) Ethene

39
Q
  1. Identify the incorrect statement regarding the synthesis of alkenes
    a) Cracking of a hydrocarbon yields alkenes
    b) The reactions are exothermic
    c) Zeolite catalyst helps in the synthesis of alkenes
    d) The synthesis of alkenes is otherwise known as
    reforming
A

b) The reactions are exothermic

39
Q
  1. Identify the one which shows E-Z mechanism
    a) 3-methylpent-2-ene
    b) 2-methylpent-2-ene
    c) Methyl-3-pent-2-ene
    d) 2,3-methylpentene
A

a) 3-methylpent-2-ene

40
Q
  1. 4-chlorobut-1-ene is the name of which among the
    following alkenes
    a) CH2Cl-CH2=CH-CH2
    b) CH2Cl-CH2-CH-CH2
    c) CH2Cl=CH2-CH=CH2
    d) CH2Cl-CH2-CH=CH2
A

d) CH2Cl-CH2-CH=CH2

41
Q
  1. Which among the following alkenes is used in the
    manufacturing of plastics
    a) Butadiene
    b) 1,2-butadiene
    c) 1,3-butadiene
    d) 2-butadiene
A

c) 1,3-butadiene

42
Q
  1. Ethylene on reaction with bromine forms which among the following product
    a) BrH2C-CH2Br
    b) BrH2C=CH2Br
    c) Br2HC=CHBr_2
    d) Br2HC-CHBr_2
A

a) BrH2C-CH2Br

43
Q
  1. Alkynes are more reactive than alkenes’ State true or false
    a) False
    b) True
A

a) False

44
Q
  1. The major alkyne, acetylene compound is produced by which among the following application on natural gas
    a) Hydrogenation
    b) Partial oxidation
    c) Cracking
    d) Hydrohalogenation
A

b) Partial oxidation

44
Q
  1. Select the incorrect statement
    a) The addition reactions occur more frequently in the
    alkenes than the alkynes
    b) The pi system of the alkynes gets weakened when they lose the pi atoms
    c) Alkynes readily undergo oligomerization
    d) Alkynes do not undergo polymerization
A

d) Alkynes do not undergo polymerization

44
Q
  1. Select the incorrect statement regarding terminal
    alkynes
    a) Methylacetylene is an example of terminal alkynes
    b) Terminal alkynes are more acidic when compared with alkenes
    c) Terminal alkynes are not as acidic as alkanes
    d) These have a replaceable acidic hydrogen atom
A

c) Terminal alkynes are not as acidic as alkanes

45
Q
  1. Majority of the alkynes are not prepared from/ by:
    a) Condensation
    b) Acetylene
    c) Dehydrohalogenation
    d) Hydrogenation
A

d) Hydrogenation

45
Q
  1. Alkynes cannot be prepared from
    a) Ketones
    b) Alcohols
    c) Aldehydes
    d) Other alkynes
A

b) Alcohols

46
Q
  1. The transformation into carboxylic acids of the alkynes takes place with the help of which among the following reagents?
    a) Potassium chlorate
    b) Potassium permanganate
    c) Potassium dichromate
    d) Potassium chloride
A

b) Potassium permanganate

47
Q
  1. Identify the incorrect statement:
    a) Alkynes exists in gaseous state
    b) They are soluble in water
    c) They are soluble in organic solvents
    d) Alkynes have a very good boiling point
A

b) They are soluble in water

47
Q
  1. Which among the following alkynes is used as a rocket fuel?
    a) Ethyne
    b) Propyne
    c) But-1-yne
    d) Pent-1-yne
A

b) Propyne

47
Q
  1. Which among the following product is formed when ethyne undergoes hydrogenation?
    a) Formaldehyde
    b) Formic acid
    c) Acetaldehyde
    d) Acetic acid
A

c) Acetaldehyde

48
Q
  1. Cycloalkanes are associated with the general formula
    a) CnH2n+2
    b) CnH2(n+2)
    c) CnH2n+1-r
    d) CnH2(n+1-r)
A

d) CnH2(n+1-r)

49
Q
  1. Cycloalkanes have the same melting and boiling points as their corresponding alkanes. State true or false
    a) True
    b) False
A

) False

50
Q
  1. Identify the incorrect statement regarding cycloalkanes
    a) These have sp3 hybridized carbons
    b) These have tetrahedral bond angles
    c) Stability of the cycloalkanes varies directly with their
    respective size
    d) These undergo nucleophilic substitution reactions
A

b) These have tetrahedral bond angles

51
Q
  1. Identify the compound with the highest ring strain
    a) Cyclomethane
    b) Cyclopropane
    c) Cyclobutane
    d) Cyclopentane
A

b) Cyclopropane

52
Q
  1. Which among the following compounds explodes on
    contact with oxygen
    a) Cyclopropane
    b) Cyclobutane
    c) Cyclopentane
    d) Cyclohexane
A

a) Cyclopropane

53
Q
  1. Identify the incorrect statement regarding cyclobutane
    a) The carbon atoms in the cyclobutane are non-coplanar
    b) These exist in nature as colourless gas
    c) Cyclobutane is a commercially important compound
    d) These compounds often show butterfly conformation
A

c) Cyclobutane is a commercially important compound

54
Q
  1. Identify the alicyclic hydrocarbon which is highly
    flammable
    a) Cycloheptane
    b) Cyclopentane
    c) Cyclopropane
    d) Cyclooctane
A

b) Cyclopentane

55
Q
  1. Identify the incorrect statement regarding cycloalkenes
    a) The bonds in them are fewer compared to those in
    alkenes
    b) They occur in gaseous form in nature
    c) These undergo polymerization
    d) The conjugated double bonds in them increase their
    stability
A

b) They occur in gaseous form in nature

55
Q
  1. Identify the incorrect statement regarding cyclohexane:
    a) It is non-polar
    b) It serves as an organic solvent
    c) It a hydrophilic hydrocarbon
    d) It is commercially used for variety of applications
A

c) It a hydrophilic hydrocarbon

56
Q
  1. Identify the incorrect statement regarding alkadiene
    a) These are acyclic acids
    b) These are unsaturated hydrocarbons
    c) These compounds have only one C=C bonds
    d) These compounds have the general formula CnH2n-2
A

c) These compounds have only one C=C bonds

56
Q
  1. Cycloalkene exhibits aromatic character. State true or false
    a) True
    b) False
A

b) False

57
Q
  1. Alkadienes are classified into how many types?
    a) 1
    b) 2
    c) 3
    d) 4
A

c) 3

58
Q
  1. Identify the incorrect statement regarding conjugated
    double bonds in alkadiene:
    a) 1,3 alkadienes have conjugated double bond
    b) Compounds with a double bond exhibit this type of
    bond
    c) 1,3 pentadiene is an example for this bond
    d) The conjugated dienes have properties similar to that of
    alkenes
A

b) Compounds with a double bond exhibit this type of
bond

58
Q
  1. Identify the one which is the perfect example for
    Isolated double bond:
    a) 1,4 pentadiene
    b) 1,2 pentadiene
    c) 1,3 pentadiene
    d) 1,5 butadiene
A

a) 1,4 pentadiene

59
Q
  1. Identify the incorrect statement regarding alkadienes
    a) Dienes show cis-trans isomerism
    b) Conjugated dienes have better stability compared to
    other dienes
    c) Dienophile supports alkadienes
    d) Alkadienes also undergo hydrobromination
A

c) Dienophile supports alkadienes

60
Q
  1. Conjugated diene reacts with which among the
    following to form a cyclohexene
    a) Phenol
    b) Dienophile
    c) Hexane
    d) Tribromo phenol
A

b) Dienophile

61
Q
  1. Which among the following dienes undergo addition
    with the help of radical-chain mechanism?
    a) Cumulated dienes
    b) Isolated dienes
    c) Simple dienes
    d) Conjugated dienes
A

d) Conjugated dienes

62
Q
  1. A molecule in which more than one single bond
    separates two double bonds are called as:
    a) Coordinate bond
    b) Isolated double bond
    c) Cumulative double bond
    d) Conjugated double bond
A

b) Isolated double bond

62
Q
  1. Identify the statement which is related to Diels-Alder
    reaction
    a) It is very stereospecific
    b) Molecular distortion takes place
    c) Cyclic dienes react very slow than the linear chain
    dienes
    d) Addition of maleic anhydride to cyclopentadiene causes
    diene and dienophile to produce different products
A

c) Cyclic dienes react very slow than the linear chain
dienes

63
Q
  1. Isolated dienes are similar in property to
    a) Monoolefins
    b) Diolefins
    c) Triolefins
    d) Tetraolefins
A

a) Monoolefins

64
Q
  1. Identify the correct statement which is related to
    aromatic hydrocarbon
    a) It has only sigma bonds
    b) It has only pi bonds
    c) It has a sigma and two pi bonds
    d) It has a sigma and delocalized pi bond
A

d) It has a sigma and delocalized pi bond

65
Q
  1. Select the incorrect option:
    a) The aromatic hydrocarbon has a pleasant aroma (smell)
    b) Some of the aromatic compounds are ring-shaped
    c) Aromatic hydrocarbon can be either mono or polycyclic
    d) Benzene is the simplest hydrocarbon
A

b) Some of the aromatic compounds are ring-shaped

66
Q
  1. Which among the following is not a property of
    aromatic hydrocarbon:
    a) These compounds have very good aromaticity
    b) These compounds have excellent stability
    c) These compounds do not undergo nucleophilic
    substitutions but they undergo electrophilic substitutions
    d) There exists a strong ratio between carbon and hyrogen
A

c) These compounds do not undergo nucleophilic
substitutions but they undergo electrophilic substitutions

66
Q
  1. Arenes does not undergo:
    a) Dehydrogenation
    b) Coupling reaction
    c) Halogenation
    d) Cyclo additions
A

a) Dehydrogenation

66
Q
  1. Which among these is the simplest example for
    polycyclic arenes?
    a) Benzacephenanthrylene
    b) Naphthalene
    c) Pyrene
    d) Dibenz-anthracene
A

b) Naphthalene

67
Q
  1. Which among these is not a representative arene
    compound?
    a) Durene
    b) Picric chloride
    c) Aspirin
    d) Mesitylene
A

b) Picric chloride

68
Q
  1. Arenes are polar. State true or false
    a) True
    b) False
A

b) False

68
Q
  1. The main sources of these arenes are:
    a) Petroleum
    b) Biogas and petroleum
    c) Petroleum and coal tar
    d) Natural gas
A

c) Petroleum and coal tar

68
Q
  1. Benzene has a stronger Vander-Waal’s force than
    Methylbenzene. State true or false
    a) False
    b) True
A

a) False

68
Q
  1. Arenes are:
    a) volatile
    b) Water soluble
    c) Non-carcinogenic
    d) Mostly gases
A

a) volatile

ChemTech (Organic Chem) (11 decks)

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