CBSE Class 12 Chemistry Amines MCQs Set A

Question : The total number of electrons around the nitrogen atom in amines are

(a) 8 (b) 7
(c) 4 (d) 3

Answer : A

Question : Amines play an important role in the survival of life. Naturally they are found in

(a) proteins  (b) vitamins
(c) alkaloids (d) All of these

Answer : D

Question : Propionamide on Hofmann degradation gives –

(a) methyl amine (b) ethyl amine
(c) propyl amine  (d) ethyl cyanide

Answer : B

Question : Secondary amines could be prepared by

(a) reduction of nitriles
(b) Hofmann bromamide reaction
(c) reduction of amides
(d) reduction of isonitriles

Answer : D

Question : Gabriel’s phthalimide synthesis is used for the preparation of

(a) Primary aromatic amines
(b) Secondary amines
(c) Primary aliphatic amines
(d) Tertiary amines

Answer : C

Question : Treatment of ammonia with excess of ethyl iodide will yield

(a) diethylamine
(b) ethylamine
(c) triethylamine
(d) tetraethylammonium iodide

Answer : D

Question : The reduction of nitro compounds is most preferred in the presence of

(a) Pd/H₂ in ethanol (b) Sn + HCl
(c) finely divided Ni  (d) iron scrap and HCl.

Answer : D

Question : An alkyl or benzyl halide on reaction with an ethanolic solution of ammonia undergoes

(a) electrophilic substitution reaction
(b) nucleophilic substitution reaction.
(c) free radical mechanism.
(d) nucleophilic addition reaction.

Answer : B

Question : Which of the following will give primary amine only ?
(i) ammonia + propylchloride
(ii) potassium pthalimide + ethylchloride
(iii) potassium pthalimide + chlorobenzene

(a) (i) and (ii)   (b) (i) and (iii)
(c) (ii) and (iii)  (d) (i), (ii) and (iii)

Answer : A

Question : Amines have

(a) Garlic odour    (b) Fishy odour
(c) Jasmine odour (d) Bitter almonds odour

Answer : B

Question : Amines behave as

(a) lewis acids    (b) lewis bases
(c) aprotic acids (d) amphoteric compounds

Answer : B

Question : The basic character of amines is due to

(a) presence of nitrogen atom
(b) lone pair of electrons on nitrogen atom
(c) tetrahedral structure
(d) high electronegativity of nitrogen

Answer : B

Question : Aliphatic amines are.....basic than NH₃ but aromatic amines are......basic than NH₃.

(a) more, less          (b) less, more
(c) both (a) and (b) (d) None of these

Answer : A

Question : Substitution of one alkyl group by replacing hydrogen of primary amines

(a) increases the base strength
(b) decreases the base strength
(c) remains the same
(d) None of the above

Answer : A

Question : Which of the following is not characteristic of amines?

(a) They smell like ammonia
(b) They are inflammable in air
(c) They show the property of hydrogen bonding
(d) They are amphoteric in nature

Answer : D

Question : Which statement is not true among the following?

(a) Amines are bases
(b) They turn red litmus blue
(c) Trimethyl amine is less basic than dimethyl amine
(d) Amines yield alcohols on aqueous hydrolysis.

Answer : D

Question : Aniline is used

(a) in crimping of wool (b) in dyeing industry
(c) in making of glue   (d) in fast drying vanish

Answer : B

Question : Which of the following statements about primary amines is False’ ?

(a) Alkyl amines are stronger bases than aryl amines
(b) Alkyl amines react with nitrous acid to produce alcohols
(c) Aryl amines react with nitrous acid to produce phenols
(d) Alkyl amines are stronger bases than ammonia

Answer : C

Question : Mark the correct statement

(a) Methylamine is slightly acidic
(b) Methylamine is less basic than ammonia
(c) Methylamine is a stronger base than ammonia
(d) Methylamine forms salts with alkalies.

Answer : C

Question : For carbylamine reaction, we need hot alcoholic KOH and

(a) any primary amine and chloroform
(b) chloroform and silver powder
(c) a primary amine and an alkyl halide
(d) a monoalkylamine and trichloromethane.

Answer : A

Question : A secondary amine is

(a) a compound with two carbon atoms and an –NH₂ group.

(b) a compound containing two –NH₂ groups.

(c) a compound in which hydrogens of NH₃ have been replaced by two alkyl groups.

(d) a compound with an –NH2 group on carbon atom in number two position.

Question : The general formula of quaternary ammonium compound is

(a) R–NH₂

(b) R₃N

(c) R₄N+ X–

(d) NH₄X

Question : The total number of electrons around the nitrogen atom in amines are

(a) 8

(b) 7

(c) 4

(d) 3

Question :  (CH₃)₂CHNH₂ is reacted with excess acetic anhydride, the compound formed is

(a) (CH₃)₂CHNCOCH₃

(b) (CH₃)₂CN(COCH₃)₂

(c) (CH₃)₂CHOH

(d) (CH₃)₂CN(COOCH₃)₂

Question : The number of primary amines of formula C₄H₁₁N is : 

(a) 1

(b) 3

(c) 4

 (d) 2

Question :  Ethylamine reacts with HNO₂ giving :

(a) C₂H₅OH

(b) C₂H₅NO₂

(c) NH₃

(d) C₂H₆

Question : The correct IUPAC name for CH₂ = CHCH₂NHCH₃ is

(a) Allylmethylamine

(b) 2-amino-4-pentene

(c) 4-aminopent-1-ene

(d) N-methylprop-2-en-1-amine

Question : Amines play an important role in the survival of life. Naturally they are found in

(a) proteins

(b) vitamins

(c) alkaloids

(d) All of these

Question : Intermediates formed during reaction of RCONH₂ with Br₂ and KOH are

(a) RCONHBr and RNCO

(b) RNHCOBr and RNCO

(c) RNHBr and RCONHBr

(d) RCONBr₂

Question :  Primary amines can be distinguished from secondary and tertiary amines by reacting with

(a) Chloroform and alcoholic KOH

(b) Methyl iodide

(c) Chloroform alone

(d) Zinc dust

Question : Propionamide on Hofmann degradation gives –

(a) methyl amine

(b) ethyl amine

(c) propyl amine

(d) ethyl cyanide

Question : Secondary amines could be prepared by

(a) reduction of nitriles

(b) Hofmann bromamide reaction

(c) reduction of amides

(d) reduction of isonitriles

Question : Gabriel’s phthalimide synthesis is used for the preparation of

(a) Primary aromatic amines

(b) Secondary amines

(c) Primary aliphatic amines

(d) Tertiary amines

Question : Ethyl amine can be obtained by the

(a) Action of NH₃ on ethyl iodide.

(b) Action of NH₃ on ethyl alcohol.

(c) Both (a) and (b)

(d) Neither (a) nor (b)

Question : Treatment of ammonia with excess of ethyl iodide will yield

(a) diethylamine

(b) ethylamine

(c) triethylamine

(d) tetraethylammonium iodide

Question : For alkylation of ammonia which of the following is not used?

(a) CH₃–X

(b) CH₃–CH₂–X

(c) (CH3)2CH–X

(d) (CH₃)₃C–X

Question : Which of the following amines can be prepared by Gabriel method ?

(i) CH₃CH₂NH₂

(ii) (CH₃)₂CHNH₂

(iii) (CH₃)₃CNH₂

(iv) C₆H₅NH₂

(a) (i) and (iii)

(b) (ii) and (iv)

(c) (i), (ii) and (iii)

(d) (i) and (ii)

Question : Amongst the given set of reactants, the most appropriate for preparing 2° amine is ___________.

(a) 2°R–Br + NH₃

(b) 2°R–Br + NaCN followed by H₂/Pt

(c) 1°R–NH₂ + RCHO followed by H₂/Pt

(d) 1°R–Br (2 mol) + Potassium phthalimide followed by H₃O+/heat

Question : The best reagent for converting 2 – phenylpropanamide into 2-phenylpropanamine is ___________.

(a) excess H₂

(b) Br₂in aqueous NaOH

(c) iodine in the presence of red phosphorus

(d) LiAlH₄in ether

Question : Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?

(a) Reaction of nitrite with LiAlH₄.

(b) Reaction of amide with LiAlH₄ followed by treatment with water.

(c) Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.

(d) Treatment of amide with bromine in aquesous solution of sodium hydroxide.

Question : The reduction of nitro compounds is most preferred in the presence of

(a) Pd/H₂ in ethanol

(b) Sn + HCl

(c) finely divided Ni

(d) iron scrap and HCl.

Question : An alkyl or benzyl halide on reaction with an ethanolic solution of ammonia undergoes

(a) electrophilic substitution reaction

(b) nucleophilic substitution reaction.

(c) free radical mechanism.

(d) nucleophilic addition reaction.

Question : In the ammonolysis of alkyl halides the halogen atom is replaced by an amino(–NH2) group which of the following represent the correct order of reactivity of halides with amines.

(a) RBr > RI > RCl

(b) RI > RCl > RBr

(c) RI > RBr > RCl 

(d) RCl > RBr > RI

Question : Which of the following will give primary amine only ?

(i) ammonia + propylchloride

(ii) potassium pthalimide + ethylchloride

(iii) potassium pthalimide + chlorobenzene

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (i), (ii) and (iii)

Question : Amines have

(a) Garlic odour

(b) Fishy odour

(c) Jasmine odour

(d) Bitter almonds odour

Question : Aniline is less soluble in water than ethyl amine due to

(a) resonance stablization of benzene ring

(b) resonance stabilization of anilium ion

(c) more hydrophobic nature of C₆H₅ group than C₂H₅ group

(d) more hydrophobic nature of C₆H₅ group than C₂H₅ Group

Question :  Which of the following is not correct ?

(a) Ethyl amine and aniline both have – NH₂ group

(b) Ethyl amine and aniline dissolve in HCl

(c) Ethyl amine and aniline both react with CHCl₃ and KOH to form unpleasant smelling compound

(d) Ethyl amine and aniline both react with HNO₂ in cold to give hydroxy compounds

Question : Amines behave as

(a) lewis acids

(b) lewis bases

(c) aprotic acids

(d) amphoteric compounds

Question : The basic character of amines is due to

(a) presence of nitrogen atom

(b) lone pair of electrons on nitrogen atom

(c) tetrahedral structure

(d) high electronegativity of nitrogen

Question : Aliphatic amines are.....basic than NH3 but aromatic amines are......basic than NH3.

(a) more, less

(b) less, more

(c) both (a) and (b)

(d) None of these

Question : Substitution of one alkyl group by replacing hydrogen of primary amines

(a) increases the base strength

(b) decreases the base strength

(c) remains the same

(d) None of the above

Question : Which of the following is not characteristic of amines?

(a) They smell like ammonia

(b) They are inflammable in air

(c) They show the property of hydrogen bonding

(d) They are amphoteric in nature

Question : The correct order of basicity in amines

(i) C₂H₅NH₂

(ii) CH₃NH₂

(iii) (CH₃)₂NH

(iv) (CH₃)₃N

(a) (i) < (iv) < (ii) < (iii)

(b) (iv) < (ii) < (iii) < (i)

(c) (i) < (ii) < (iii) < (iv)

(d) (ii) < (iii) < (iv) < (i)

Question : The conjugate base of (CH₃)₂NH⁺² is

(a) (CH₃)₂NH

(b) (CH₃)₂N+\

(c) (CH₃)₃N+

(d) (CH₃)₂N–

Question : High basicity of Me₂NH relative to Me₃N is attributed to:

(a) effect of solvent

(b) inductive effect of Me\

(c) shape of Me₂NH

(d) shape of Me₃N

Question :  Hinsberg reagent is

(a) C₆H₅SO₃H

(b) C₆H₅NO

(c) C₆H₅SO₂Cl

(d) C₆H₅N₂Cl

Question : Which of the following statement is correct ?

(a) Ammonia is more basic than methylamine.

(b) Methylamine is more basic than ammonia.

(c) Dimethylamine is less basic than methylamine.

(d) Dimethylamine is less basic than trimethylamine.

Question :  Reaction of aniline with benzaldehyde is

(a) substitution

(b) addition

(c) condensation

(d) polymerization

Question :  The amine that does not react with acetyl chloride is

(a) CH₃NH₂

(b) (CH₃)₂NH

(c) (CH₃)₃N

(d) None of these

Question : The correct decreasing order of basic strength of the following species is __________ H2O, NH3, OH, NH2 –                        

(a) NH₂ – > OH– > NH₃ > H₂O

(b) OH– > NH₂ – > H₂O > NH₃

(c) NH₃ > H₂O > NH₂ – > OH–

(d) H₂O > NH₃ > OH–> NH₂ –

Question : Which of the following factors affect the basic strength of amine?

(i) Inductive effect

(ii) Steric hinderance

(iii) Solvation effect

(iv) Solubility in organic solvents.

(a) (i) and (iv)

(b) (i), (ii) and (iii)

(c) (ii) and (iii)

(d) (ii) and (iv)

Question : Which statement is not true among the following?

(a) Amines are bases

(b) They turn red litmus blue

(c) Trimethyl amine is less basic than dimethyl amine

(d) Amines yield alcohols on aqueous hydrolysis.

Question : Aniline is used

(a) in crimping of wool

(b) in dyeing industry

(c) in making of glue

(d) in fast drying vanish

Question : Which of the following statements about primary amines is ‘False’ ?

(a) Alkyl amines are stronger bases than aryl amines

(b) Alkyl amines react with nitrous acid to producealcohols

(c) Aryl amines react with nitrous acid to produce phenols

(d) Alkyl amines are stronger bases than ammonia

Question : Mark the correct statement

(a) Methylamine is slightly acidic

(b) Methylamine is less basic than ammonia

(c) Methylamine is a stronger base than ammonia

(d) Methylamine forms salts with alkalies.

Question : For carbylamine reaction, we need hot alcoholic KOH and

(a) any primary amine and chloroform

(b) chloroform and silver powder

(c) a primary amine and an alkyl halide

(d) a monoalkylamine and trichloromethane.

Question : The compound obtained by heating a mixture of a primary amine and chloroform with ethanolic potassium hydroxide (KOH) is

(a) an alkyl cyanide

(b) a nitro compound

(c) an alkyl isocyanide

(d) an amide

Question :  Which of the following compounds cannot be identified by carbylamine test?

(a) CH₃CH₂NH₂

(b) CHCl₃

(c) C₆H₅NH₂

(d) C₆H₅–NH–C₆H₅

Question : Carbylamine reaction is used for the detection of

(a) aliphatic 2° amines

(b) aliphatic 1° amines

(c) aromatic 1° amines

(d) Both (b) and (c)

Question : An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitrosoamine. The compound is

(a) CH₃NH₂

(b) CH₃CH₂NH₂

(c) CH₃CH₂NHCH₂CH₃

(d) (CH₃CH₂)₃N