NEET2026ChemistryChapterActual
Consider the following reaction sequences for 1-bromopropane: CH ₃ CH ₂ CH ₂ Br KCN (alc.) P LiAlH ₄ Q CH ₃ CH ₂ CH ₂ Br AgCN (alc.) R LiAlH ₄ S The major products Q and S are respectively:
Options
- AN-Methylpropan-1-amine and Butan-1-amine
- BButan-1-amine and Butan-1-amine
- CButan-1-amine and N-Methylpropan-1-amine
- DPropan-1-amine and N-Methylpropan-1-amine
Correct answer
C. Butan-1-amine and N-Methylpropan-1-amine
Step-by-step solution
Reaction of 1-bromopropane with alcoholic KCN yields propyl cyanide (butanenitrile) as the major product P because KCN is predominantly ionic, leading to nucleophilic attack through the carbon atom. CH ₃ CH ₂ CH ₂ Br + KCN CH ₃ CH ₂ CH ₂ CN (P) Reduction of P with LiAlH ₄ produces a primary amine, butan-1-amine ( Q ). CH ₃ CH ₂ CH ₂ CN LiAlH ₄ CH ₃ CH ₂ CH ₂ CH ₂ NH ₂ (Q) Reaction of 1-bromopropane with alcoholic AgCN yields propyl isocyanide as the major product R because AgCN is predominantly covalent, leading to