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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Question 4.
Which one of the following is aromatic amine ?
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 1
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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 2
(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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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 pKb value ?
(a) (CH3)3CNH2
(b) NH3
(c) (CH3)2NH
(d) CH3NH2
Answer:
(b) NH3

Question 17.
Most basic species amongst the following is
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 3
Answer:
(d)

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 4
Answer:
(c)

Question 20.
Which of the following is amphoteric in nature ?
(a) CH3NH2
(b) CH3NHCH3
(c) CH3CONH2
(d)
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 5
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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Question 25.
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 6
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 (C2Hs)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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 7
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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Question 32.
The end product Z of the reaction :
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 8
(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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 9
(a) KOH/Br2, LiAIH4
(b) KOH/Br2,CH3COCl
(c) HNO2, (CH3CO)2O
(d) KOH/Br2,CH3OH/Na
Answer:
(b) KOH/Br2,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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 10
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 11
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+

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

Question 46.
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 12
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
Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines 13
(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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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

Bihar Board 12th Chemistry Objective Answers Chapter 13 Amines

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