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(a) a compound in which hydrogens of NH₃ have been replaced by two alkyl groups.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

Question. The total number of electrons around the nitrogen atom in amines are
(a) 8
(b) 4
(c) 7
(d) 3

Answer: A

Question. The number of primary amines of formula C₄H₁₁N is
(a) 4
(b) 1
(c) 3
(d) 2

Answer: A

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: A

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: A

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: A

Question. Propionamide on Hofmann degradation gives –
(a) ethyl amine
(b) ethyl cyanide
(c) methyl amine
(d) propyl amine

Answer: A

Question. Secondary amines could be prepared by
(a) reduction of isonitriles
(b) reduction of amides
(c) Hofmann bromamide reaction
(d) reduction of nitriles

Answer: A

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: A

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: A

Question. Treatment of ammonia with excess of ethyl iodide will yield
(a) tetraethylammonium iodide
(b) triethylamine
(c) ethylamine
(d) diethylamine

Answer: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

Question. Amines have
(a) Fishy odour
(b) Bitter almonds odour
(c) Garlic odour
(d) Jasmine odour

Answer: A

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: A

Question. Amines behave as
(a) lewis bases
(b) amphoteric compounds
(c) lewis acids
(d) aprotic acids

Answer: A

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: A

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

Answer: A

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: A

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: A

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: A

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: A

Question. Aniline is used
(a) in dyeing industry
(b) in fast drying vanish
(c) in crimping of wool
(d) in making of glue

Answer: A

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: A

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: A

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. 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: A

Question. Carbylamine reaction is used for the detection of
(a) Both
(b) aliphatic 2° amines
(c) aromatic 1° amines
(d) None of these

Answer: A

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: A

Question. Ethylamine reacts with HNO₂ giving
(a) C₂H₅OH
(b) NH₃
(c) C₂H₆
(d) None of these

Answer: A

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: A

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: A

Question. Hinsberg reagent is
(a) C₆H₅SO₂Cl
(b) C₆H₅SO₃H
(c) C₆H₅NO
(d) None of these

Answer: A

Question. Reaction of aniline with benzaldehyde is
(a) condensation
(b) substitution
(c) addition
(d) polymerization

Answer: A

Question. The amine that does not react with acetyl chloride is
(a) (CH₃)₃N
(b) CH₃NH₂
(c) (CH₃)₂NH
(d) None of these

Answer: A

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: A

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: A