Class 12 Chemistry Amines Practice Questions (Answers)

Class 12 Chemistry Amines Practice Questions (Answers)

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Class 12 Chemistry Amines Practice Questions

Ans 1. Step 1. A mixture of two aromatic compounds (A) and (B) was separated by dissolving in chloroform followed by extraction with aqueous KOH solution.
Compound + CHCl₃ ——KOH (aq) → C₆H₅NH₂ + C₆H₅OH
A → C₆H₅NH₂ (Aniline)
B → C₆H₅OH (Phenol)

Step 2. The organic layer containing compound (A), when heated with an alcoholic solution of KOH produced a compound (C) (C₇H₅N) associated with an unpleasant odour.
C₆H₅NH₂ + CHCl₃ ——KOH (aq) → C₆H₅NC + KCl + H₂O
C → Unpleasant odour or Foul-smelling Compound Phenyl isocyanide(C₆H₅NC)

Step 3.  The alkaline aqueous layer on the other hand, when heated with chloroform and then acidified gives a mixture of two isomeric compounds (D) and (E) of molecular formula C₇H₆O₂.

Ans 2. A → PhSO₂NHEt
B → PhSO₂N^–Et
C → PhSO₂NEt₂
D → PhSO₂OH
E → Et₂NH₂⁺

Ans 3. (a) CH₃NHCH₂CH₃
(b) CH₂ = HCCH₂ N (CH₃)₂
(C) PhCH₂N(CH₃) CH₂CH₃

Ans 4.  (a, b, c, d)

Ans 5. (a), (c)

Ans 6. (b), (c), (d)

Ans  7. (i). (b) 2-propanol
Ans (ii). (c)

Ans 8. (i). (d)
(ii). (b) A-R, B-P, C-S, D-Q

Class 12 Chemistry Amines Practice Questions (Answers)