NEET Chemistry Question (2026) — Solution

Step-by-step solution

Nitriles (R-CN) can be reduced to primary amines (R-CH_2NH_2) using strong reducing agents or catalytic hydrogenation. Reagent A: LiAlH _4 followed by hydrolysis is a strong reducing agent that reduces nitriles to primary amines. Reagent C: H _2/ Ni (catalytic hydrogenation) reduces nitriles to primary amines. Reagent D: Na(Hg) / C _2 H _5 OH (Mendius reduction) provides nascent hydrogen and reduces nitriles to primary amines. Reagent B: Sn + HCl is typically used to reduce nitro compounds to amines. (Note: SnCl _2 + HCl is used in Stephen reduction to convert nitriles to aldehydes). Reagent E: Br _2/ aq. NaOH is used for Hoffmann bromamide degradation to convert amides to primary amines, not nitriles. Thus, A, C, and D are the correct reagents. Answer: A, C and D only