Q105 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Marks: 2 · Difficulty: Medium
The major product formed in the following reaction is: 
+ 
+ (a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence medium
Explanation
Diphenylketene adds to the less substituted C=C of isoprene by [2+2] (π2s + π2a) to give a vinyl-substituted cyclobutanone (b) (source key b).
Study loop for Pericyclic Reactions