JEE Chemistry Amines MCQs Set B

Question. –NH₂ group in aniline is
(a) o-and p-directing
(b) only p-directing
(c) only o-directing
(d) only m-directing

Answer: A

Question. Strong activating effect of –NH₂ group is reduced by using
(a) CH₃COCl
(b) CH₃ONa
(c) CH₃Cl
(d) CH₃–CHO

Answer: A

Question. When bromination of aniline is carried out by protecting –NH₂. The product is
(a) mixture of o-and p-bromoaniline
(b) p-bromoaniline
(c) 2, 4, 6 tribromoaniline
(d) o-bromoaniline

Answer: A

Question. Hinsberg’s method to separate amines is based on the use of
(a) benzene sulphonyl chloride
(b) benzene sulphonic acid
(c) ethyl oxalate
(d) acetyl chloride

Answer: A

Question. Which of the following statements is not correct regarding aniline?
(a) It is soluble in water
(b) It reacts with sodium to give hydrogen
(c) It can be steam-distilled
(d) It is less basic than ethylamine

Answer: A

Question. Aniline and other arylamines are usually colourless but get coloured on storage due to___________.
(a) atmospheric oxidation
(b) dehydration
(c) hydrolysis
(d) reduction

Answer: A

Question. The acylation reaction of amines is carried out in presence of pyridine because
(i) pyridine is stronger base than amine.
(ii) pyridine is weaker base than amine.
(iii) pyridine removes HCl formed and shifts the equilibrium to the right hand side.
(iv) pyridine removes HCl formed and shifts the equilibrium to the left hand side.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)

Answer: A

Question. N– ethyl benzene sulphonyl amide is strongly acidic and soluble in alkali due to presence of
(a) strong electron withdrawing sulphonyl group
(b) strong electron donating sulphonyl group
(c) weak electron donating sulphonyl group
(d) weak electron withdrawing sulphonyl group

Answer: A

Question. Arrange the following in increasing order of their basic strength?
p–nitroaniline(1); m–nitroaniline (2); 2,6–trimethylaniline(3); 3–methylanline(4).
(a) 1, 2, 4, 3
(b) 2, 3, 4, 1
(c) 1, 3, 2, 4
(d) 3, 1, 2, 4

Answer: A

Question. Diazonium salt is obtained when aniline reacts with
(a) NaNO₂ and HCl (0–5°C)
(b) N₂O at (0 – 5°C)
(c) cold NaOH
(d) SnCl₂ at 10°C

Answer: A

Question. Azo dye is prepared by the coupling of phenol and
(a) diazonium chloride
(b) benzoic acid
(c) chlorobenzene
(d) o-nitroaniline

Answer: A

Question. Which of the following reagents will convert p-methylbenzenediazonium chloride into p-cresol?
(a) H₂O
(b) C₆H₅OH
(c) Cu powder
(d) H₃PO₂

Answer: A

Question.  When phenol and benzene diazonium chloride are coupled, the main product is
(a) p-hydroxyazobenzene
(b) chlorobenzene
(c) aniline
(d) azobenzene

Answer: A

Question. In the diazotization of arylamines with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to
(a) Supress the concentration of free aniline available for coupling
(b) Supress hydrolysis of phenol
(c) Ensure a stoichiometric amount of nitrous acid
(d) Neutralise the base liberated

Answer: A

Question. Which of the following reagent can be used to convert benzenediazonium chloride into benzene?
(a) H₃PO₂
(b) LiAlH₄
(c) CH₃OH
(d) None of these

Answer: A

Question. When benzenediazonium chloride in hydrochloric acid reacts with cuprous chloride, then chlorobenzene is formed. The reaction is called
(a) Sandmeyer reaction
(b) Perkin reaction
(c) Gattermann reaction
(d) Etard reaction

Answer: A

Question. Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.
(a) Nitrobenzene
(b) Phenol
(c) Anisole
(d) Aniline

Answer: A

Question. Which of the following cannot be prepared by Sandmeyer’s reaction?
(i) Chlorobenzene (ii) Bromobenzene
(iii) Iodobenzene (iv) Fluorobenzene
(a) (ii) and (iii)
(b) (i) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Answer: A

Question. Read the following statements and choose the correct option.
(i) Nitrogen atom in amines is sp³-hybridised.
(ii) The geometry of amines is pyramidal.
(iii) The angle C–N–C or C–N–H is slightly more than 109.5°.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iii)
(d) (i) and (iii)

Answer: A

Question. Which of the following statements are correct ?
(i) Lower aliphatic amines are soluble in water.
(ii) Solubility increases with decrease in molar mass of amines.
(iii) Higher amines are insoluble in water.
(iv) Amines are soluble in organic solvents.
(a) (i), (iii) and (iv)
(b) (i) and (iv)
(c) (i), (ii) and (iii)
(d) (ii), (iii) and (iv)

Answer: A

Question. Which of the following statements are correct ?
(i) Primary amines show more intermolecular association than secondary amines.
(ii) Tertiary amines do not show intermolecular association.
(iii) Boiling points of isomeric alkenes follow the order 3° > 2° > 1°
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (i), (ii) and (iii)

Answer: A

Question. Which of the following statements are correct ?
(i) In Sandmeyer reaction nucleophiles like Cl^–, Br^– and CN^– are indroduced in benzene ring in the presence of Cu⁺ ion
(ii) In Gattermann reaction nucleophiles are introduced in benzene ring in the presence of copper powder and HCl.
(iii) The yield in Gattermann reaction is found to be better than Sandmayer reaction.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iii)
(d) (i) and (iii)

Answer: A

Question. Assertion : Aromatic 1°amines can be prepared by Gabriel phthalimide synthesis.
Reason : Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
Reason : FeCl₂ formed gets hydrolysed to release HCl during the reaction.
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : Amines are basic in nature.
Reason : Amines have lone pair of electrons on nitrogen atom.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Acetanilide is less basic than aniline.
Reason : Acetylation of aniline results in decrease of electron density on nitrogen
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : Nitration of aniline can be conveniently done by protecting the amino group by acetylation.
Reason : Acetylation increases the electron-density in the benzene ring.
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertoin : Aniline does not undergo Friedel-Crafts reaction.
Reason : –NH₂ group of aniline reacts with AlCl₃ (Lewis acid) to give acid-base reaction.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.
Reason : Acyl group sterically hinders the approach of further acyl groups.
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: A

Question. The IUPAC name of diethyl isopropyl amine is
(a) N, N-diethylpropan-2-amine
(b) N, N-diethylpropan-1-amine
(c) N, N-diethylisopropylamine
(d) N, N-diethylaminopropane

Answer: A

Question. Acetamide is treated with the following reagents separately. Which one of these would yield methylamine?
(a) NaOH – Br₂
(b) Sodalime
(c) PCl₅
(d) None of these

Answer: A

Question. Amine that cannot be prepared by Gabriel phthalimide synthesis is
(a) aniline
(b) methylamine
(c) benzylamine
(d) None of these

Answer: A

Question. A primary amine is formed by an amide on treatment with bromine and alkali. The primary amine has
(a) 1 carbon atom less than amide
(b) 1 carbon atom more than amide
(c) 1 hydrogen atom less than amide
(d) 1 hydrogen atom more than amide

Answer: A

Question. High basicity of Me₂NH relative to Me₃N is attributed to
(a) effect of solvent
(b) shape of Me₂NH
(c) inductive effect of Me
(d) shape of Me₃N

Answer: A

Question. Which one of the following is the strongest base in aqueous solution ?
(a) Dimethylamine
(b) Trimethylamine
(c) Methylamine
(d) Aniline

Answer: A

Question. The correct order of the increasing basicity of methyl amine, ammonia and aniline is
(a) aniline < ammonia < methyl amine
(b) aniline < methyl amine < ammonia
(c) ammonia < aniline < methyl amine
(d) methyl amine < aniline < ammonia

Answer: A

Question. Aniline when treated with conc. HNO₃ gives
(a) m-Nitroaniline
(b) p-Phenylenediamine
(c) p-Benzoquinone
(d) None of these

Answer: A

Question. Towards electrophilic substitution, the most reactive will be
(a) Aniline
(b) Aniline hydrochloride
(c) N-Acetylaniline
(d) Nitrobenzene

Answer: A