Q41 / 150 · MHT CET 2026 (11 April Shift 1) · Chemistry
Identify the product obtained when Grignard reagent reacts with alkyl cyanide followed by acid hydrolysis.
- Aan aldehyde
- Correct answerBa ketone
- Ca primary alcohol
- Da secondary alcohol
Solution
Grignard reagents ($R'MgX$) react with alkyl cyanides ($R-C\equiv N$) to form an imine salt intermediate.
$R-C\equiv N + R'MgX \rightarrow R-C(R')=NMgX$
Upon acid hydrolysis, the imine salt is converted into a ketone.
$R-C(R')=NMgX + H_3O^+ \rightarrow R-C(=O)-R' + NH_3 + Mg(OH)X$
Thus, the final product obtained is a ketone.
Answer: a ketone
$R-C\equiv N + R'MgX \rightarrow R-C(R')=NMgX$
Upon acid hydrolysis, the imine salt is converted into a ketone.
$R-C(R')=NMgX + H_3O^+ \rightarrow R-C(=O)-R' + NH_3 + Mg(OH)X$
Thus, the final product obtained is a ketone.
Answer: a ketone
Hence, the correct answer is option: 'B'.