ABC26OR0407 · Reagents Reaction Mechanisms and Named Reactions
Subject: Organic Chemistry · Chapter: Reagents Reaction Mechanisms and Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: CSIR-NET 2019 · Marks: 2 · Difficulty: Medium
The major products A and B in the following reaction sequence are: 
(a)
(b)
(c)
(d)
$B=$
$B=$Answer
Answer (as printed): C
Explanation
The mechanism of the reaction is given below: First step involves the mannich reaction, followed by methylation of mannich base to form a quaternary salt, on elimination gives an alkene. In second step, α-β unsaturated ketone gives 1,4 addition product with NaCN, as shown in the mechanism.
Explanation as extracted from the printed page; notation may be imperfect.