The major product P formed in the following photochemical reaction is · ABC26OR0555
Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
The major product P formed in the following photochemical reaction is 
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence medium
Explanation
Type-A (lumiketone) photorearrangement of the 4,4-diarylcyclohexenone (Zimmerman): the electron-poor p-cyanophenyl migrates preferentially to the β-carbon, giving the bicyclo[3.1.0]hexanone with the cyanophenyl on the cyclopropane and phenyl at the ring junction (b).
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