JEE Main · 2022 · 25 Jul 2022 · Shift 1 · Chapter_pending

Most stable product of the following reaction is:

(A)(see structure)
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

This is an E2 elimination reaction. The substrate reacts with alcoholic KOH (a strong base) to undergo elimination. The most stable alkene product is formed following Zaitsev's rule — the more substituted alkene is favored. Among the given options, option (B) represents the most substituted and therefore most stable alkene product. The reaction proceeds via anti-periplanar elimination of HBr to give the major product shown in (B).

JEE Main · 2022 · 25 Jul 2022 · Shift 1 · Single correct option

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