JEE Chemistry Amines MCQs Set A

Question: A secondary amine is

• a) a compound in which hydrogens of NH₃ have been replaced by two alkyl groups.
• b) a compound with an –NH₂ group on carbon atom in number two position
• c) a compound containing two –NH₂ groups
• d) a compound with two carbon atoms and an –NH₂ group

Answer: a compound in which hydrogens of NH₃ have been replaced by two alkyl groups.

Question: The general formula of quaternary ammonium compound is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

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

• a) 8
• b) 4
• c) 7
• d) 3

Answer: 8

Question:

• a) 2-amino-3-hydroxy propanoic acid
• b) amino hydroxy propanoic acid
• c) 2-amino-propan-3-oic acid
• d) 3-amino-hydroxy propine acid

Answer: 2-amino-3-hydroxy propanoic acid

Question: The number of primary amines of formula C₄H₁₁N is

• a) 4
• b) 1
• c) 3
• d) 2

Answer: 4

Question:

• a) 5-methyl-3-hexanamine
• b) 2-methyl-4-amino hexane
• c) 5-methyl-3-amino hexane
• d) 2-methyl-4-hexanamine

Answer: 5-methyl-3-hexanamine

Question: The correct IUPAC name for CH₂ = CHCH₂NHCH₃ is

• a) N-methylprop-2-en-1-amine
• b) 4-aminopent-1-ene
• c) 2-amino-4-pentene
• d) Allylmethylamine

Answer: N-methylprop-2-en-1-amine

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

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

Answer: All of these

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

• a) RCONHBr and RNCO
• b) RNHBr and RCONHBr
• c) RNHCOBr and RNCO
• d) RCONBr₂

Answer: RCONHBr and RNCO

Question: Which of the following reactions will not give a primary amine?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Propionamide on Hofmann degradation gives –

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

Answer: ethyl amine

Question: Secondary amines could be prepared by

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

Answer: reduction of isonitriles

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

• a) Primary aliphatic amines
• b) Tertiary amines
• c) Secondary amines
• d) None of these

Answer: Primary aliphatic amines

Question: Ethyl amine can be obtained by the

• a) Both
• b) Action of NH₃ on ethyl iodide.
• c) Action of NH₃ on ethyl alcohol.
• d) None of these

Answer: Both

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

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

Answer: tetraethylammonium iodide

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

• a) (CH₃)₃C–X
• b) CH₃–CH₂–X
• c) CH₃–X
• d) None of these

Answer: (CH₃)₃C–X

Question:

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

Answer: (i) and (ii)

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

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

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

• a) LiAlH₄in ether
• b) iodine in the presence of red phosphorus
• c) Br₂in aqueous NaOH
• d) excess H₂

Answer: 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) Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.
• b) Treatment of amide with bromine in aquesous solution of sodium hydroxide
• c) Reaction of nitrite with LiAlH₄.
• d) None of these

Answer: Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.

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

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

Answer: iron scrap and HCl.

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

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

Answer: nucleophilic substitution 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) RI > RBr > RCl
• b) RBr > RI > RCl
• c) RI > RCl > RBr
• d) RCl > RBr > RI

Answer: RI > RBr > RCl

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

Answer: (i) and (ii)

Question: Amines have

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

Answer: Fishy odour

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

• a) more hydrophobic nature of C₆H₅ group than C₂H₅ group
• b) resonance stabilization of anilium ion
• c) resonance stablization of benzene ring
• d) None of these

Answer:  more hydrophobic nature of C₆H₅ group than C₂H₅ group

Question:

• a) IV
• b) III
• c) II
• d) I

Answer: IV

Question: Amines behave as

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

Answer: lewis bases

Question: The basic character of amines is due to

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

Answer:  lone pair of electrons on nitrogen atom

Question: Aliphatic amines are.....basic than NH₃ but aromatic amines are......basic than NH_3.

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

Answer: more, less

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: increases the base strength

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

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

Answer: They are amphoteric in nature

Question:

• a) (iv) < (ii) < (iii) < (i)
• b) (ii) < (iii) < (iv) < (i)
• c) (i) < (iv) < (ii) < (iii)
• d) (i) < (ii) < (iii) < (iv)

Answer: (iv) < (ii) < (iii) < (i)

Question:

• a) (CH₃)₂NH
• b) (CH₃)₂N⁺
• c) (CH₃)₂N^–
• d) None of these

Answer: (CH₃)₂NH

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

• a) effect of solvent
• b) inductive effect of Me
• c) shape of Me₃N
• d) shape of Me₂NH

Answer: effect of solvent

Question:

• a) C > A > B
• b) B > A > C
• c) A > B > C
• d) C > B > A

Answer: C > A > B

Question: Which of the following statement is correct ?

• a) Methylamine is more basic than ammonia
• b) Ammonia is more basic than methylamine
• c) Dimethylamine is less basic than methylamine
• d) Dimethylamine is less basic than trimethylamine

Answer: Methylamine is more basic than ammonia

Question: Which of the following compounds is most basic?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

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), (ii) and (iii)
• b) (ii) and (iv)
• c) (ii) and (iii)
• d) (i) and (iv)

Answer: (i), (ii) and (iii)

Question: Which statement is not true among the following?

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

Answer: Amines yield alcohols on aqueous hydrolysis

Question: Aniline is used

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

Answer: in dyeing industry

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

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

Answer: Aryl amines react with nitrous acid to produce phenols

Question: Mark the correct statement

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

Answer: Methylamine is a stronger base than ammonia

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: any primary amine and chloroform

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

• a) an alkyl isocyanide
• b) an alkyl cyanide
• c) a nitro compound
• d) an amide

Answer: an alkyl isocyanide

Question:

• a) RNHCOCH₃
• b) RN(COCH₃)₂
• c) R – CONH₂
• d) None of these

Answer: RNHCOCH₃

Question: Carbylamine reaction is used for the detection of

• a) Both
• b) aliphatic 2° amines
• c) aromatic 1° amines
• d) None of these

Answer: Both

Question:

• a) N₂
• b) CO₂
• c) NH₃
• d) O₂

Answer: N₂

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

• a) CH₃CH₂NHCH₂CH₃
• b) CH₃NH₂
• c) CH₃CH₂NH₂
• d) None of these

Answer: CH₃CH₂NHCH₂CH₃

Question: Ethylamine reacts with HNO₂ giving

• a) C₂H₅OH
• b) NH₃
• c) C₂H₆
• d) None of these

Answer: C₂H₅OH

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

Answer: Chloroform and alcoholic KOH

Question: Which of the following is not correct ?

• a) Ethyl amine and aniline both react with HNO₂ in cold to give hydroxy compounds
• b) Ethyl amine and aniline both react with CHCl₃ and KOH to form unpleasant smelling compound
• c) Ethyl amine and aniline dissolve in HCl
• d) Ethyl amine and aniline both have – NH₂ group

Answer: Ethyl amine and aniline both react with HNO₂ in cold to give hydroxy compounds

Question: Hinsberg reagent is

• a) C₆H₅SO₂Cl
• b) C₆H₅SO₃H
• c) C₆H₅NO
• d) None of these

Answer: C₆H₅SO₂Cl

Question: Reaction of aniline with benzaldehyde is

• a) condensation
• b) substitution
• c) addition
• d) polymerization

Answer: condensation

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

• a) (CH₃)₃N
• b) CH₃NH₂
• c) (CH₃)₂NH
• d) None of these

Answer: (CH₃)₃N

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

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

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

• a) (CH₃)₂CN(COCH₃)₂
• b) (CH₃)₂CN(COOCH₃)₂
• c) (CH₃)₂CHOH
• d) None of these

Answer: (CH₃)₂CN(COCH₃)₂

Question: In order to distinguish between C₂H₅–NH₂ and C₆H₅–NH₂, which of the following reagent is useful

• a) HNO₂
• b) NaOH
• c) Hinsberg’s reagent
• d) CHCl₃ + KOH

Answer: HNO₂