In the reaction, [X] the major product [X] is: · ABC26OR0568
Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Easy
In the reaction, 
[X] the major product [X] is:
[X] the major product [X] is:(a)
(b)
(c)
(d)
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed C; on checking, A is correct — see the explanation.
Explanation
Heating triggers the oxy-Cope of the divinyl diol to octane-2,7-dione (via the enediol); H₂SO₄ then closes the five-membered ring by intramolecular aldol and dehydrates to 1-acetyl-2-methylcyclopentene (a).
Study loop for Pericyclic Reactions