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NCERT Class XII Chemistry
Chapter - Amines
Questions with Solutions

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Question : 5
Total: 22
How will you convert :
(i) Ethanoic acid into methanamine
(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine
(v) Ethanoic acid into porpanoic acid
(vi) Methanamine into ethanamine
Solution:  
(i)
CH3COOH
Ethanoic‌acid
SOCl2
––––––––▶
CH3COCl
Ethanoyl‌chloride
NH3(excess)
––––––––▶
CH3CONH2
Ethanamide
Br2∕KOH
––––––––––––––––––––▶
(Hofmann‌bromamide‌reaction)
CH3NH2
Methanamine
(ii)CH3(CH2)4CN
H3O+
––––––––▶
Hydrolysis
CH3(CH2)4COOH
Hexanoic‌acid
PCl5
––––––––▶
CH3(CH2)4COCl
Hexanoyl‌chloride
NH3(excess)
––––––––▶
Δ
CH3(CH2)4CONH2
Br2∕KOH
––––––––▶
CH3(CH2)4NH2
1−Aminopentane
(iii)
CH3OH
Methanol
PCl5
––––––––▶
CH3Cl
KCN(alc.)
––––––––▶
CH3CN
Ethanenitrile
H3O+
––––––––▶
CH3COOH
Ethanoic‌acid
(iv)
CH3CH2NH2
Ethanamide
HCl+NaNO3
––––––––▶
CH3CH2OH
Ethanol
K2Cr2O7∕H2SO4
–––––––––––––▶
CH3COOH
Ethanoic‌acid
NH3
––––––––▶
CH3COONH4
−H2O
––––––––▶
Δ
CH3CONH2
Ethanamide
Br2∕KOH
––––––––▶
CH3NH2
Methanamine
(v)
CH3COOH
Ethanoic‌acid
LiAlH4
––––––––▶
Reduction
CH3CH2OH
Ethanol
P∕I2
––––––––▶
CH3CH2I
Ethyl‌iodide
KCN
––––––––▶
−KI
CH3CH2CN
Ethyl‌cyanide
H2O∕H+
––––––––▶
CH3CH2COOH
Propanoic‌acid
(vi)
CH3NH2
Methanamine
HONO
––––––––▶
−N2,−H2O
CH3OH
P∕I2
––––––––▶
CH3I
Methyl‌iodide
−KI
––––––––▶
KCN
CH3CN
Na∕C2H5OH
––––––––▶
Reduction
CH3CH2NH2
Ethanamine
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