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ChemTech (Organic Chem) > Claisen and Cross Claisen condensation > Flashcards

Claisen and Cross Claisen condensation Flashcards

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1
Q
  1. Which of the following is a product formed in Claisen
    condensation?
    a) β- ester
    b) β-ketone
    c) β-keto ester
    d) Y-diketone
A

a) β- ester

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2
Q
  1. Which type of precursor is used as reactant in
    intramolecular Claisen condensation?
    a) One molecule with an ester end
    b) Two molecules of ester
    c) One molecule with two ester ends
    d) One molecule of ester and enolate
A

c) One molecule with two ester ends

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3
Q
  1. Which of the following stamen is incorrect about Claisen
    condensation?
    a) The product is a β-keto ester which resists
    deprotonation by the strong base in the reaction mixture
    b) The reaction involves the condensation of two esters in
    the presence of strong base
    c) A strong base is required to remove H+ from an α-H
    position in one of the starting esters
    d) A strong base is required to remove H+ from an α-H
    position in one of the starting esters
A

a) The product is a β-keto ester which resists

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4
Q
  1. Lye is used in soap-making. Lye is a concentrated
    solution of which ionic compound?
    a) K2CO3
    b) CuSO4
    c) NaOH
    d) NaCl
A

a) K2CO3

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5
Q
  1. Which of the following term describe saponification?
    a) Cleaving of ester molecules into carboxylic acid and
    alcohol
    b) Dehydration synthesis by removing water
    c) Hydrolysis of a salt by adding a weak acid
    d) Synthesis of two alkyl groups to make an ether
A

a) Cleaving of ester molecules into carboxylic acid and
alcohol

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6
Q
  1. Which of the following is considered a useful alkali in
    saponification reactions?
    a) CCl4
    b) Cl–
    c) NaOH
    d) Pb+
A

c) NaOH

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7
Q
  1. Saponification value is the number of milligrams of KOH
    required to saponify what present in the 1g of oil or fat?
    a) Salts
    b) Hydrocarbon
    c) Fatty acids
    d) unsaturation
A

c) Fatty acids

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7
Q
  1. Which of the following is a product formed in Claisen
    condensation?
    a) β- ester
    b) β-ketone
    c) β-keto ester
    d) Y-diketone
A

c) β-keto ester

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7
Q
  1. Which of the following compound is an industrial
    manufacturing product by saponification?
    a) Sodium chloride
    b) Potassium hydroxide
    c) Glycerol
    d) Sodium hydroxide
A

c) Glycerol

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7
Q
  1. Which of the following fat or oil is unsaponifiable?
    a) Paraffin wax
    b) Bee wax
    c) Olive oil
    d) Shea butter
A

a) Paraffin wax

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7
Q
  1. Which of the following statement is true about
    saponification value of oil?
    a) The shorter the chain of fatty acid, the higher is the
    saponification value
    b) The shorter the chain of fatty acid, the higher is the
    saponification value
    c) The higher the saturation in chain of fatty acid, the
    lower is the saponification value
    d) The lower the saturation in chain of fatty acid, the
    higher is the saponification value
A

a) The shorter the chain of fatty acid, the higher is the
saponification value

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8
Q
  1. Soap can be precipitated out by salting by using which
    chemical compound?
    a) Sodium chloride
    b) Potassium hydroxide
    c) Glycerol
    d) Sodium hydroxide
A

a) Sodium chloride

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9
Q
  1. Which of the following stamen is incorrect about Claisen
    condensation?
    a) The product is a β-keto ester which resists
    deprotonation by the strong base in the reaction mixture
    b) The reaction involves the condensation of two esters in
    the presence of strong base
    c) A strong base is required to remove H+ from an α-H
    position in one of the starting esters
    d) A strong base is required to remove H+ from an α-H
    position in one of the starting esters
A

a) The product is a β-keto ester which resists
deprotonation by the strong base in the reaction mixture

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10
Q
  1. Which type of precursor is used as reactant in
    intramolecular Claisen condensation?
    a) One molecule with an ester end
    b) Two molecules of ester
    c) One molecule with two ester ends
    d) One molecule of ester and enolate
A

c) One molecule with two ester ends

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10
Q
  1. Dieckmann Condensation is intramolecular
    condensation of ……. to form cyclic product.
    a) diamide
    b) diol
    c) diester
    d) diketone
A

c) diester

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11
Q
  1. What is the other name for the intramolecular Claisen
    condensation?
    a) Perkin condensation
    b) Stobbe condensation
    c) Knoevenagel condensation
    d) Dieckmann condensation
A

d) Dieckmann condensation

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12
Q
  1. Ethylamine can be prepared by the action of bromine
    and caustic potash on which compound?
    a) Acetamide
    b) Propionamide
    c) Formamide
    d) Methyl cyanide
A

b) Propionamide

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13
Q
  1. The amine formed from an amide by means of bromine
    and alkali has how many number of carbon atoms?
    a) Same number of C atoms as that of amide
    b) One less C atom than that of amide
    c) One more C atom than that of amide
    d) Two more C atoms than that of amide
A

b) One less C atom than that of amide

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13
Q
  1. When methyl iodide is heated with ammonia, what is
    the product obtained?
    a) Methylamine
    b) Dimethylamine
    c) Trimethylamine
    d) A mixture of the above three amines
A

d) A mixture of the above three amines

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13
Q
  1. Reduction of nitroalkanes yields which compound?
    a) Acid
    b) Alcohol
    c) Amine
    d) Diazo compounds
A

b) Alcohol

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14
Q
  1. Which one of the following compound gives a secondary
    amine on reduction?
    a) Nitromethane
    b) Nitrobenzene
    c) Methyl isocyanide
    d) Methyl cyanide
A

c) Methyl isocyanide

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14
Q
  1. The Hinsberg’s method is used for which of the
    following?
    a) Preparation of primary amines
    b) Preparation of secondary amines
    c) Preparation of tertiary amines
    d) Separation of amine mixtures
A

d) Separation of amine mixtures

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14
Q
  1. What is the name of the reaction when acetamide
    changes into methylamine?
    a) Hofmann bromamide reaction
    b) Hofmann reaction
    c) Friedel-Craft’s reaction
A

a) Hofmann bromamide reaction

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15
Q
  1. When ethanol is mixed with ammonia and passed over
    alumina the compound formed is which compound?
    a) C2H5NH2
    b) C2H4
    c) C2H5OC2H5
    d) CH3OCH3
A

a) C2H5NH2

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16
Q
  1. Which of the following reactions will not give primary
    amine?
    a) CH3CONH2 + KOH.Br2
    b) CH3CN + LiAlH4
    c) CH3NC + LiAlH4
    d) CH3CONH2 + LiAlH4
A

c) CH3NC + LiAlH4

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17
Q
  1. Which type of amine is produced by reaction of ketones
    with primary amines, followed by reduction?
    a) Secondary Aromatic amine
    b) N-substituted amine
    c) N, N-disubstituted amine
A

b) N-substituted amine

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17
Q
  1. Which type of amine is produced by reaction of
    ketones with secondary amines, followed by reduction?
    a) Secondary Aromatic amine
    b) N-substituted amine
    c) N, N-disubstituted amine
    d) Primary aromatic amine
A

c) N, N-disubstituted amine

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18
Q
  1. What is the characteristic smell of liquid amines?
    a) Fish like smell
    b) Rotten egg smell
    c) Fruity smell
    d) Bitter almond smell
A

a) Fish like smell

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18
Q
  1. Which of the following have less melting point than
    amine?
    a) Alcohol
    b) Phosphine
    c) Carboxylic acid
    d) Ether
A

b) Phosphine

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18
Q
  1. Which of the following compound is expected to be
    most basic?
    a) Aniline
    b) Methylamine
    c) Hydroxylamine
    d) Ethylamine
A

d) Ethylamine

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19
Q
  1. A solution of methyl amine shows which type of
    property with litmus paper?
    a) Turns blue litmus red
    b) Turns red litmus blue
    c) Does not affect red or blue litmus
    d) Bleaches litmus
A

b) Turns red litmus blue

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19
Q
  1. Which of the following statement is true about methyl
    amine?
    a) Methyl amine is slightly acidic
    b) Methyl amine is less basic than NH3
    c) Methyl amine is stronger base than NH3
    d) Methyl amine forms salts with alkali
A

c) Methyl amine is stronger base than NH3

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19
Q
  1. By the presence of a halogen atom in the ring, what is
    the effect of this on basic properties of aniline?
    a) Increased
    b) Decreased
    c) Unchanged
    d) Doubled
A

a) Increased

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20
Q
  1. If methyl is alkyl group, then which order of basicity is
    correct?
    a) R2NH > RNH2 > R3N > NH3
    b) R2NH > R3N > RNH2 > NH3
    c) RNH2 > NH3 > R2NH > R3N
    d) NH3 > RNH2 > R2NH > R3N
A

a) R2NH > RNH2 > R3N > NH3

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20
Q
  1. Which statement is an incorrect statement?
    a) Amines form hydrogen bond
    b) Ethyl amine has higher boiling point than propane
    c) Methyl amine is more basic than ammonia
    d) Dimethyl amine is less basic than methyl amine
A

d) Dimethyl amine is less basic than methyl amine

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21
Q
  1. Which of the following amine has highest boiling point?
    a) Butyl amine
    b) Diethylamine
    c) Triethylamine
    d) Dipropylamine
A

d) Dipropylamine

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21
Q
  1. Unpleasant smelling carbylamines are formed by
    heating alkali and chloroform with which of the following?
    a) Any amine
    b) Any aliphatic amine
    c) Any aromatic amine
    d) Any primary amine
A

d) Any primary amine

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21
Q
  1. What is the correct decreasing order of the basic
    character of the three amines and ammonia?
    a) NH3 > CH3NH2 > C2H5NH2 > C6H5NH2
    b) C2H5NH2 > CH3NH2 > NH3 > C6H5NH2
    c) C6H5NH2 > C2H5NH2 > CH3NH2 > NH3
    d) CH3NH2 > C2H5NH2 > C6H5NH2 > NH3
A

b) C2H5NH2 > CH3NH2 > NH3 > C6H5NH2

22
Q
  1. Which of the following is most basic?
    a) C6H5NH2
    b) (CH3)2NH
    c) (CH3)3N
    d) NH3
A

b) (CH3)2NH

23
Q
  1. Among the following, which one is the strongest base?
    a) C6H5NH2
    b) p−NO2C6H4NH2
    c) m−NO2−C6H4NH2
    d) C6H5CH2NH2
A

d) C6H5CH2NH2

23
Q
  1. Which of the following is true characteristic feature of
    aniline?
    a) Colourless solid
    b) Brown coloured solid
    c) Colourless liquid
    d) Brown coloured liquid
A

c) Colourless liquid

24
Q
  1. The correct order of basicity of amines in water is
    which of the following?
    a) (CH3)2NH > (CH3)3N > CH3NH2
    b) CH3NH2 > (CH3)2NH > (CH3)3N
    c) (CH3)3N > (CH3)2NH > CH3NH2
    d) (CH3)3N > CH3NH2 > (CH3)2NH
A

a) (CH3)2NH > (CH3)3N > CH3NH2

25
Q
  1. Which of the following is converted into an alcohol on
    treatment with HNO2?
    a) Methyl amine
    b) Aniline
    c) Dimethyl amine
    d) Triethyl amine
A

a) Methyl amine

26
Q
  1. The action of nitrous acid on ethyl amine gives which of
    the following?
    a) Ethane
    b) Ammonia
    c) Ethyl acohol
    d) Nitroethane
A

c) Ethyl acohol

27
Q
  1. p-chloroaniline and anilinium hydrochloride can be
    distinguished by which test?
    a) Sandmeyer reaction
    b) NaHCO3
    c) AgNO3
    d) Carbylamine test
A

b) NaHCO3

27
Q
  1. Nitroso amines (R2N−N=O) are soluble in water. On
    heating them with concentrated H2SO4 they give
    secondary amines. What is this reaction called as?
    a) Perkin’s reaction
    b) Fittig’s reaction
    c) Sandmeyer’s reaction
    d) Liebermann’s nitroso reaction
A

d) Liebermann’s nitroso reaction

27
Q
  1. Aniline reacts with acetaldehyde to form which of the
    following?
    a) Schiff’s base
    b) Carbylamine
    c) Immine
    d) Diazonium salt
A

c) Immine

28
Q
  1. Primary amines can be distinguished from secondary
    and tertiary amines by reacting with which of the
    following?
    a) Chloroform and alcoholic KOH
    b) Methyl iodide
    c) Chloroform alone
    d) Zinc dust
A

a) Chloroform and alcoholic KOH

28
Q
  1. Ethyl amine undergoes oxidation in the presence of
    KMnO4 to form which compound?
    a) An acid
    b) An alcohol
    c) An aldehyde
    d) A nitrogen oxide
A

c) An aldehyde

29
Q
  1. When primary amines are treated with HCl, the product
    obtained is which of the following?
    a) An alcohol
    b) A cyanide
    c) An amide
    d) Ammonium salt
A

d) Ammonium salt

29
Q
  1. Reaction of primary amines with aldehyde yields which
    of the following compound?
    a) Amides
    b) Aldimines
    c) Nitriles
    d) Nitro compounds
A

b) Aldimines

30
Q
  1. The compound which on reaction with aqueous nitrous
    acid on HNO2 at low temperature produces an oily
    nitrosoamine is which of the following?
    a) Diethylamine
    b) Ethylamine
    c) Aniline
    d) Methylamine
A

a) Diethylamine

31
Q
  1. When an organic compound was treated with sodium
    nitrite and hydrochloric acid in the ice cold, nitrogen gas
    was evolved copiously. What is the compound?
    a) A nitrocompound
    b) A primary amine
    c) An aliphatic primary amine
    d) An aromatic primary amine
A

c) An aliphatic primary amine

31
Q
  1. When chloroform reacts with ethyl amine in presence
    of alcoholic KOH, the compound formed is which of the
    following?
    a) Ethyl cyanide
    b) Ethyl isocyanide
    c) Formic acid
    d) An amide
A

b) Ethyl isocyanide

32
Q
  1. The reaction of HNO2 with ‘A’ gives quaternary
    ammonium salt. A is which of the following?
    a) Methyl amine
    b) Dimethyl amine
    c) Trimethyl amine
    d) Aniline
A

c) Trimethyl amine

32
Q
  1. Aniline on treatment with excess of bromine water
    which of the following?
    a) Aniline bromide
    b) o-bromoaniline
    c) p-bromoaniline
    d) 2, 4, 6-tribromoaniline
A

d) 2, 4, 6-tribromoaniline

33
Q
  1. A primary amine can be converted to an alcohol by the
    action of which of the following?
    a) Alkali
    b) Nitrous acid
    c) Reducing agent
    d) Oxidizing agent
A

b) Nitrous acid

34
Q
  1. The amine which can react with C6H5−SO2−Cl to form a
    product insoluble in alkali shall be, is which of the
    following?
    a) Primary amine
    b) Secondary amine
    c) Tertiary amine
    d) Both primary and secondary amines
A

b) Secondary amine

34
Q
  1. Primary amines react with nitrous acid to yield which
    of the following?
    a) Insoluble nitrite salts
    b) Yellow oily layer
    c) Nitrogen gas
    d) Azo dye
A
35
Q
  1. A mixture of benzene and aniline can be separated by
    which of the following?
    a) Hot water
    b) dil. HCl
    c) dil. NaOH
    d) Alcohol
A

b) dil. HCl

36
Q
  1. Nitration of aniline also gives m-nitro aniline, in strong
    acidic medium because of which of the following reasons?
    a) In electrophilic substitution reaction amino group is
    meta directive
    b) Inspite of substituents nitro group always goes to m-
    position
    c) In strong acidic medium, nitration of aniline is a
    nucleophic substitution reaction
    d) In strong acidic medium aniline present as anilinium ion
A

b) Inspite of substituents nitro group always goes to m-
position

37
Q
  1. An organic amino compound reacts with aqueous
    nitrous acid at low temperature to produce an oily nitroso
    amine. What is this compound?
    a) CH3NH2
    b) CH3CH2NH2
    c) CH3CH2NH.CH2CH3
    d) (CH3CH2)3
A

b) CH3CH2NH2

37
Q
  1. Reaction of aniline with benzaldehyde is which type of
    reaction?
    a) Polymerisation
    b) Condensation
    c) Addition
    d) Substitution
A

b) Condensation

38
Q
  1. Electrophilic substitution of aniline with bromine in
    presence of gacial acetic acid gives which of the following?
    a) 1, 4, 6-tribromo aniline
    b) 2, 4, 6-tribromo aniline
    c) 4-bromo aniline
    d) 3-bromo aniline
A

c) 4-bromo aniline

38
Q
  1. In the reaction, what is the compound C6H5N=CHC6H5is
    known as?
    C6H5CHO + C6H5NH2 → C6H5N=HCC6H5 + H2O
    a) Aldol
    b) Schiffs reagent
    c) Schiffs base
    d) Benedict reagent
A

c) Schiffs base

39
Q
  1. Ethyl amine on acetylation gives which of the following?
    a) N-ethyl acetamide
    b) Acetamide
    c) Methyl acetamide
    d) Propyl acetamide
A

a) N-ethyl acetamide

39
Q
  1. During acetylation of amines what is replaced by acetyl
    groups?
    a) Hydrogen atom attached to nitrogen atom
    b) One or more hydrogen atoms attached to carbon atom
    c) One or more hydrogen atoms attached to nitrogen atom
    d) Hydrogen atoms attached to either carbon atom or
    nitrogen atom
A

c) One or more hydrogen atoms attached to nitrogen atom

40
Q
  1. Aniline reacts with which of these to form Schiff base?
    a) Acetic acid
    b) Benzaldehyde
    c) Acetone
    d) NH3
A

b) Benzaldehyde

40
Q
  1. p-chloro aniline and anilinium hydrogen chloride can
    be distinguished by which of the following?
    a) Sandmaeyer reaction
    b) Carbyl amine reaction
    c) Hinsberg’s reaction
    d) AgNO3
A

d) AgNO3

41
Q
  1. Aniline is usually purified by which of the following
    method?
    a) Steam distillation
    b) Simple distillation
    c) Vacuum distillation
    d) Extraction with a solvent
A

a) Steam distillation

42
Q
  1. Reaction of cyclohexanone with dimethylamine in the
    presence of catalytic amount of an acid forms a compound
    if water during the reaction is continuously removed.
    What is the compound formed is generally known as?
    a) A Schiff’s base
    b) An enamine
    c) An imine
    d) An amine
A

b) An enamine

42
Q
  1. The reductive amination of an aldehyde (e.g. the
    reaction of propanal with ethylamine) can be carried out in
    the laboratory using which of the following as a reducing
    agent?
    a) NaBH3CN
    b) LiAlH4
    c) BH3
    d) NaBH4
A

a) NaBH3CN

43
Q
  1. Which type medium is required for the formation of
    aniline by reaction of aryl boric acid and HAS?
    a) Acidic
    b) Basic aqueous
    c) Neutral dry
    d) aqueous
A

b) Basic aqueous

44
Q
  1. In the direct amination of alkyl and aryl pinacol
    boronates to form aromatic amine, which of the following
    is used as reagent with pinacol?
    a) Aryl boric acid
    b) Copper oxide
    c) Pd(OAc)2
    d) Lithiated methoxyamine
A

d) Lithiated methoxyamine

45
Q
  1. Which reducing agent is used for the reduction of nitro
    compound to phenyl amine?
    a) LiAlH4
    b) Sn/HCl
    c) Na/alcohol
    d) H2/Ni
A

b) Sn/HCl

45
Q
  1. Which of the following method cannot be used for
    preparation of aromatic amine?
    a) Gabriel phthalimide synthesis
    b) Reduction of nitro compound
    c) Reduction of nitrile with LiAl4
    d) Decarboxylation of amino acids
A

a) Gabriel phthalimide synthesis

46
Q
  1. What is the known name of the given reaction?
    C6H5N+
    2 + CuCl → C6H5Cl + N2 + Cu+
    a) Gattermanns reaction
    b) Sandmeyers reaction
    c) Dehydrogenation reaction
    d) Esterification reaction
A

b) Sandmeyers reaction

46
Q
  1. What is the general formula of Diazonium salt?
    a) RN2^+X^–
    b) RN^+
    c) RXI
    d) RN_2^+HSO^-2
A

a) RN2^+X^–

47
Q
  1. What is the known name of the given reaction?
    C6H5N+
    2 + CuX → C6H5X + N2 + Cu+
    a) Gattermanns reaction
    b) Sandmeyers reaction
    c) Dehydrogenation reaction
    d) Esterification reaction
A

a) Gattermanns reaction

48
Q
  1. What is the known name of the given reaction?
    [C6H5N+
    2]Cl− + C6H6 → C6H5−C6H5 + N2 + HCl
    a) Gattermanns reaction
    b) Sandmeyers reaction
    c) Gomberg–Bachmann reaction
    d) Esterification reaction
A

c) Gomberg–Bachmann reaction

48
Q
  1. What is the known name of the given reaction?
    [C6H5N+
    2]BF−
    4 → C6H5F + BF3 + N2
    a) Gattermanns reaction
    b) Sandmeyers reaction
    c) Dehydrogenation reaction
    d) Balz-Schiemann reaction
A

d) Balz-Schiemann reaction

49
Q
  1. Benzene diazonium chloride when reacts with
    hypophosphorus acid produces which of the following
    compound?
    a) Benzene
    b) Phenyl phosphate
    c) Phenol
    d) Phenyl isocyanide
A

a) Benzene

49
Q
  1. What is the known name of the given reaction?
    [C6H5N+2]Cl− + ArCH=CHCO2H → ArC=C−C6H5 + N2 + CO2 +
    HCl
    a) Gattermanns reaction
    b) Sandmeyers reaction
    c) Meerwein reaction
    d) Balz-Schiemann reaction
A

a) Gattermanns reaction

50
Q
  1. When hypophosphorous acid is treated with diazonium
    salts, it is reduced to which of the following compound?
    a) Arene
    b) Methane
    c) Ethyl alcohol
    d) Amines
A

a) Arene

50
Q
  1. p-amino azo benzene is obtained by treating diazonium
    chloride with which of the following compound?
    a) Benzene
    b) Aniline
    c) Phenol
    d) Benzoic acid
A

b) Aniline

51
Q
  1. Which of the following amine will form stable
    diazonium salt at 273-283 K?
    a) C6H5NH2
    b) C6H5N(CH3)2
    c) C2H5NH2
    d) C6H5CH2NH2
A

a) C6H5NH2

52
Q
  1. When diazonium salt solution is treated with KI, it
    forms which of the following compound?
    a) Bromobenzene
    b) Iodobenzene
    c) Phenol
    d) Acid
A

b) Iodobenzene

52
Q
  1. Azo dye is prepared by the coupling of phenol and which
    of the following compound?
    a) Diazonium chloride
    b) o-nitro aniline
    c) Benzoic acid
    d) Chlorobenzene
A

a) Diazonium chloride

52
Q
  1. Benzene diazonium chloride forms orange red dye with
    which of the following compound?
    a) Nitrophenol
    b) Benzophenol
    c) Resorcinol
    d) Methanol
A

c) Resorcinol

52
Q
  1. Replacement of diazo group by other groups is helpful in
    preparing those substituted aromatic compounds which
    cannot be prepared which type of reaction?
    a) Direct elimination
    b) Addition reaction
    c) Direct substitution
    d) Replacement reaction
A

c) Direct substitution

53
Q
  1. What happens when benzene diazonium chloride is
    treated with potassium cyanide in presence of Cu powder?
    a) Benzophenone
    b) Methyl isocyanide
    c) Acetonitrile
    d) Benzonitrile
A

d) Benzonitrile

53
Q
  1. By treating diazonium salts with cuprous cyanide or KCN
    and copper powder it forms which of the following
    compound?
    a) Citric acid
    b) Benzoic acid
    c) Aryl nitrile
    d) Oxalic acid
A

c) Aryl nitrile

54
Q
  1. Identify the product in following order when 3,4,5
    Tribromoaniline undergoes diazotisation followed by
    attack of H3PO2?
    a) 3, 4,5-Tribromobenzene
    b) 1, 2, 3-Tribromobenzene
    c) 2, 4, 6-Tribromobenzene
    d) 3, 4, 5-Tribromo nitro benzene
A

a) 3, 4,5-Tribromobenzene

55
Q
  1. When diazonium salt solution is treated with KI, it
    forms which of the following compound?
    a) Bromobenzene
    b) Iodobenzene
    c) Phenol
    d) Acid
A

b) Iodobenzene

ChemTech (Organic Chem) (11 decks)

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