Which of the following reactions does not yield a primary amine as the major product?

Step-by-step solution

Reduction of amides ( R-CONH ₂ ) with LiAlH ₄ yields primary amines. Thus, propanamide gives propan-1-amine. Reduction of nitriles ( R-CN ) with H ₂/ Ni yields primary amines. Thus, ethanenitrile gives ethanamine. Reduction of nitroalkanes ( R-NO ₂ ) with Sn + HCl yields primary amines. Thus, nitroethane gives ethanamine. Reduction of isocyanides (isonitriles, R-NC ) with LiAlH ₄ yields secondary amines containing an - NHCH ₃ group. Thus, methyl isocyanide ( CH ₃ NC ) yields N-methylmethanamine ( CH ₃ NHCH ₃ ), whi