Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Bihar Board 12th Chemistry Objective Questions and Answers

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Question 1.
Nitrogen atom of amino group is……….. hybridised.
(a) sp
(b) sp²
(c) sp³
(d) sp³d
Answer:
(c) sp³

Question 2.
C₃H₉N cannot represent
(a) 1° amine
(b) 2° amine
(c) 3° amine
(d) quaternary ammonium salt
Answer:
(d) quaternary ammonium salt

Question 3.
Which of the following is not  a primary amine ?
(a) tert-Butyiamine
(b) sec-Butylamine
(c) Isobutylamine
(d) Dimelhylamine
Answer:
(d) Dimelhylamine

Question 4.
Which one of the following is aromatic amine ?

Answer:
(d)

Question 5.
IUPAC name of the compound (C₂H₅)₂ NCH is
(a) 2, 2-diethylmethanamine
(b) N, N-diethylmethanamine
(c) N-ethyl-N-methylethanamine
(d) N-methylbutanamine
Answer:
(c) N-ethyl-N-methylethanamine

Question 6.
eduction of aromatic nitro compounds using Sn and HCl gives
(a) armatic primary amines
(b) aromatic secondary amines
(c) aromatic tertiary amines
(d) aromatic amides
Answer:
(a) armatic primary amines

Question 7.
When excess of ethyl iodide is treated with ammonia, the product is
(a) ethylamine
(b) diethylamine
(c) triethylamine
(d) tetraethylammonium iodide
Answer:
(d) tetraethylammonium iodide

Question 8.
Secondary amines can be prepared by
(a) reduction of nitro compounds
(b) reduction of amides
(c) reduction of isonitriles
(d) reduction of nitriles
Answer:
(c) reduction of isonitriles

Question 9.
Reduction of CH₃CH₂NC with hydrogen in presence of Ni or Pt as catalyst gives
(a)CH₃CH₂NH₂
(b) CH₃CH₂NHCH₃
(c)CH₃CH₂NHCH₂CH₃
(d) (CH₃)₃N
Answer:
(b) CH₃CH₂NHCH₃

Question 10.
What is the end product in the following squence of reaction

(a) Aniline
(b) Phenol
(c) Benzene
(d) Benzenediazonium chloride
Answer:
(a) Aniline

Question 11.
The most conveninet method to prepare an amine containing one carbon atom less is
(a) Gabriel phthalimide synthesis
(b) reductive animation of aldehydes
(c) Hofmann bromamide reaction
(d) reduction of isonitriles
Answer:
(c) Hofmann bromamide reaction

Question 12.
Amine that cannot be prepared by Gabriel phthalimide synthesis is
(a) aniline
(b) benzyl amine
(c) methyl amine
(d) iso-butylamine
Answer:
(a) aniline

Question 13.
Which of the following amides will give ethylamine on reaction with sodium hypobromide ?
(a) Butanamide
(b) Propanamite
(c) Acetamide
(d) Benzamide
Answer:
(b) Propanamite

Question 14.
Tertiary amines have lowest boiling points amongst isomeric amines because
(a) they have highest molecular mass
(b) they do not form hydrogen bonds
(c) they are more polar in nature
(d) they are most basic in nature
Answer:
(b) they do not form hydrogen bonds

Question 15.
Choose the correct statements from the following :
(a) Methyl amine is less soluble than propyl amine
(b) Methyl amine is solid with fishy odour
(c) Aniline gets coloured on storage
(d) Amines are more polar than alcohols
Answer:
(c) Aniline gets coloured on storage

Question 16.
Which of the following has highest pK_b value ?
(a) (CH₃)₃CNH₂
(b) NH₃
(c) (CH₃)₂NH
(d) CH₃NH₂
Answer:
(b) NH₃

Question 17.
Most basic species amongst the following is

Answer:
(d)

Question 18.
The strongest base among the following is
(a) C₆H₅NH₂
(b) p- NH₂C₆H₄NH₂
(c) m- NO₂C₆H₄NH₂
(d) C₆H₅CH₂NH₂
Answer:
(d) C₆H₅CH₂NH₂

Question 19.
The most basic amine among the following is

Answer:
(c)

Question 20.
Which of the following is amphoteric in nature ?
(a) CH₃NH₂
(b) CH₃NHCH₃
(c) CH₃CONH₂
(d)

Answer:
(c) CH₃CONH₂

Question 21.
Primary amines react with benzoyl chloride to give
(a) benzamides
(b) ethanamides
(c) imides
(d) imines
Answer:
(a) benzamides

Question 22.
What is obtained when benzoyl chloride reacts with aniline in the presence of sodium hydroxide ?
(a) Benzoic acid
(b) Benzanilide
(c) Acetanilide
(d) Azobenzene
Answer:
(b) Benzanilide

Question 23.
Acetylation of a secondary amine in alkaline medium yields
(a) N, N-dialkylacetamide
(b) N, N-dialkylamine
(c) N, N-dialkylamide
(d) acetyl dialkylamine
Answer:
Acetylation of a secondary amine in alkaline medium yields
(a) N, N-dialkylacetamide

Question 24.
Primary and secondary amines react with acid chloride or acid anhydride to form
(a) tertiaryammonium salts
(b) substituted amides
(c) diazonium salts
(d) nitro compounds
Answer:
(b) substituted amides

Question 25.

Z in the above reaction is
(a) CH₃CH₂CH₂NHCOCH₃
(b) CH₃CH₂CH₂NH₂
(c) CH₃CH₂CH₂CONHCH₃
(d) CH₃CH₂CH₂CONHCOCH₃
Answer:
(a) CH₃CH₂CH₂NHCOCH₃

Question 26.
Which of the following amines will give carbylamine reaction ?
(a) (C₂H₅)₃N only
(b) (C₂H₅)₂NH only
(c) C₂H₅NH₂ only
(d) C₃H₇NHC₂H₅ only
Answer:
(c) C₂H₅NH₂ only

Question 27.
Which of the following will form isocyanide on reaction with CHCl₃ and KOH?
(a) C₆H₅NHCH₃
(b) CH₃C₆H₄NH₂
(c) C₆H₅NHC₄H₉
(d) C₆H₅N (C₂H_s)₂
Answer:
(b) CH₃C₆H₄NH₂

Question 28.
Which of the following compounds cannot be identified by carbylamine test ?
(a) CH₃CH₂NH₂
(b) (CH₃)₂CHNH₂
(c) C₆H₅NH₂
(d) C₆H₅NHC₆H₅
Answer:
(d) C₆H₅NHC₆H₅

Question 29.
When p-toluidine reacts with chloroform and alcoholic KOH, then the product is

Answer:
(b)

Question 30.
The action of nitrous acid on an aliphatic primary amine gives
(a) secondary amine
(b) nitroalkane
(c) alcohol
(d) alkyl nitride
Answer:
(c) alcohol

Question 31.
Which of the following compounds reacts with NaNO₂ and HCl and 0-4°C to give alcohol/phenol ?
(a) C₆H₅NH₂
(b) C₂H₅NH₂
(c) CH₃NHCH₃
(d) C₆H₅NHCH₃
Answer:
(b) C₂H₅NH₂

Question 32.
The end product Z of the reaction :

(a) propanenitrile
(b) triethylaminc
(c) diethylamine
(d) propylamine
Answer:
(a) propanenitrile

Question 33.
Primary and secondary amines are distinguished by
(a) Br₂/KOH
(b) HCIO
(c) HNO₂
(d) NH₃
Answer:
(c) HNO₂

Question 34.
The reagent required to convert

(a) KOH/Br₂, LiAIH₄
(b) KOH/Br_2,CH₃COCl
(c) HNO₂, (CH₃CO)₂O
(d) KOH/Br_2,CH₃OH/Na
Answer:
(b) KOH/Br_2,CH₃COCl

Question 35.
Which of the following is used as Hinsberg’s reagent ?
(a) C₆H₅SO₂Cl
(b) C₆H₅SO₃H
(c) C₆H₅NHCH₃
(d) C₆H₅COCH₃
Answer:
(a) C₆H₅SO₂Cl

Question 36.
The reaction of benzenesulphonyl chloride with ethylamine yields
(a) N-ethylbenzenesulphonamide, insoluble in alkali
(b) N, N-diethylbenzenesulphonamide, souble in alkali
(c) N, N-diethylbenzenesulphonarriide, insoluble in alkali
(d) N-ethylbenzenesulphonamide, soluble in alkali
Answer:
(d) N-ethylbenzenesulphonamide, soluble in alkali

Question 37.
Which of the following amines does not react with Hinsberg reagent ?
(a) CH₃CH₂ — NH₂
(b) CH₃ — NH — CH₃
(c) (CH₃CH₂)₃N
(d) All of these
Answer:
(c) (CH₃CH₂)₃N

Question 38.
Primary, secondary and tertiary amines may be separated by using
(a) iodoform
(b) diethyloxalate
(c) benzenesulphonyl chloride
(d) acetyl chloride
Answer:
(c) benzenesulphonyl chloride

Question 39.
Etectrophilic substitution of aniline with bromine water at room temperature gives
(a) 2-bromoaniline
(b) 3-bromoaniline
(c) 2,4, 6-tribromoaniline
(d) 3, 5, 6-tribromoaniline
Answer:
(c) 2,4, 6-tribromoaniline

Question 40.
Anilinium hydrogensulphate on heating with sulphuric acid at 453-473 K produces
(a) sulphanilic acid
(b) benzenesulphonic acid
(c) aniline
(d) anthranilic acid
Answer:
(a) sulphanilic acid

Question 41.
When aniline is heated with cone. H₂SO₄ at 455 – 475 K, it forms
(a) aniline hydrogensulphate
(b) sulphanilic acid
(c) amino benzene sulphonic acid
(d) benzenesulphonic acid
Answer:
(b) sulphanilic acid

Question 42.
During preparation of arenediazonium salts, the excess of nitrous acid, if any, is destroyed by adding
(a) aq. NaOH
(b) aq. Na₂CO₃
(c) aq. NH₂CONH₂
(d) aq.KI
Answer:
(c) aq. NH₂CONH₂

Question 43.
Which of the following options is correct regarding the property of benzenediazonium fluoroborate ?
(a) It is water soluble at room temperature
(b) It is water insoluble and stable at room temperature
(c) It is a coloured solid
(d) None of these
Answer:
(b) It is water insoluble and stable at room temperature

Question 44.
The structure of product X in the following reaction is


Answer:
(a)

Question 45.
Which of the following is correct method to convert p- toluidine to p-toluic acid ?
(a) Diazotisation, CuCN, H₂/Pd
(b) CHCl₃/NaOH, KCN, Sn/HCl
(c) Diazotisation, CuCN/KCN/ H₂O/H⁺
(d) Diazotisation, NaCN, NaOH
Answer:
(c) Diazotisation, CuCN/KCN/ H₂O/H⁺

Question 46.

The end product S in the given sequence of reactions is
(a) benzoic acid
(b) benzene
(c) phenol
(d) chlorobenzene
Answer:
(b) benzene

Question 47.
The product ‘D’ in the following sequence of reactions is

(a) 2,4, 6-tribromofluorobenzene
(b) fluorobenzene
(c) p-bromofluorobenzene
(d) tribromobenzene
Answer:
(a) 2,4, 6-tribromofluorobenzene

Question 48.
The coupling reaction of aryldiazonium chloride with aniline are carried out in
(a) strongly acidic medium
(b) strongly basic medium
(c) mild basic medium
(d) mild acidic medium
Answer:
(c) mild basic medium

Question 49.
Which of the following is a 3° amine ?
(a) 1-Methylcyclohexylamine
(b) Triethylamine
(c) tert-Butylamine
(d) N-Methylaniline
Answer:
(b) Triethylamine

Question 50.
The correct IUPAC name for CH₂ = CHCH₂NHCH₃ is
(a) allylmethylamine
(b) 2-amino-4-pentene
(c) 4-aminopent-l-ene
(d) N-methylprop-2-en-l-amine
Answer:
(d) N-methylprop-2-en-l-amine

Question 51.
Amongst the following, the strongest base in aqueous medium is……….
(a) CH₃NH₂
(b) NCCH₂NH₂
(c) (CH₃)₂NH
(d) C₆H₅NHCH₃
Answer:
(c) (CH₃)₂NH

Question 52.
The source of nitrogen in Gabriel synthesis of amines is
(a) sodium azide, NaN₃
(b) sodium nitrae, NaNO₂
(c) potassium cyanide, KCN
(d) potassium phethalimide, C₆H₄(CO)₂N^– K⁺
Answer:
(d) potassium phethalimide, C₆H₄(CO)₂N^– K⁺

Question 53.
The best reagent for converting 2-phenylpro-panamide into 2-phenylpropanamine is………….
(a) excess Ht
(b) Br₂ in aqueous NaOH
(c) iodine in the presence of red phosphorus
(d) LiAIH₄ in ether
Answer:
(d) LiAIH₄ in ether

Question 54.
The best reagent for converting, 2-phenylpro-panamide into 1-phenylethanamine is………
(a) excess H₂/Pt
(b) NaOH/Br₂
(c) NaBH₄/methanol
(d) LiAlH₄/ether
Answer:
(b) NaOH/Br₂

Question 55.
Hofmann bromamide degradation reaction is shown by………..
(a) ArNH₂
(b) ArCOCH₂
(c) ArNO₂
(d) ArCH₂NH₂
Answer:
(b) ArCOCH₂

Question 56.
Methylaminc reacts with HNO₂ to form
(a) CH₃– O – N = O
(b) CH₃ – O – CH₃
(c) CH₃OH
(d) CH₃OHO
Answer:
(c) CH₃OH

Question 57.
The gas evolved when methylamine reacts with nitrous acid is
(a) NH₃
(b) N₂
(c) H₂
(d) C₂H₆
Answer:
(b) N₂

Question 58.
Reduction of aromatic nitro compounds using Fe and HCl gives……..
(a) aromatic oxime
(b) aromatic hydrocarbon
(c) aromatic primary amine
(d) aromatic amide
Answer:
(c) aromatic primary amine

Question 59.
Acid anhydrides on reaction with primary amines give
(a) amide
(b) imide
(c) secondary amine
(d) imine
Answer:
(a) amide

Question 60.
Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
(a) Hofmann bromamide reaction
(b) Gabriel phthalimide synthesis
(c) Sandmeyer reaction
(d) Reaction with NH₃
Answer:
(b) Gabriel phthalimide synthesis

Question 61.
Which of the following compounds will not undergo azo coupling reaction with benzene diazonium chloride
(a) Aniline
(b) Phenol
(c) Anisole
(d) Nitrobenzene
Answer:
(d) Nitrobenzene