Benzyl isocyanide can be obtained from Choose the correct answer from the options given below :
- A and B Only
- A and C Only
- B and D Only
- D and E Only
Answer
(1) A and B Only
Solution
A. Benzyl bromide + AgCN: AgCN is mainly covalent, so the nitrogen end attacks ⇒ C6H5CH2Br + AgCN C6H5CH2NC + AgBr (benzyl isocyanide) ✓
B. Benzylamine (a primary amine) + CHCl3 + alcoholic/aq. KOH or NaOH – carbylamine reaction ⇒ C6H5CH2NH2 + CHCl3 + 3OH- C6H5CH2NC + 3Cl- + 3H2O ✓
C. Bromobenzene: the C–Br bond has partial double-bond character, so aryl halides do not undergo this substitution – no benzyl isocyanide ✗
D. Aniline gives phenyl isocyanide C6H5NC, not benzyl isocyanide ✗
E. KCN is ionic, attack is through carbon ⇒ C6H5CH2CH2CN (a nitrile, and with one extra C) ✗
∴ A and B only
Answer: (1)