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Question
Which of the following gives cis-2, 3-diphenylbut-2-ene as the major E2 product, when treated with ethanolic KOH solution:?
1. 
2.
3. 
4. 
Which of the following gives cis-2, 3-diphenylbut-2-ene as the major E2 product, when treated with ethanolic KOH solution:?
1.
2.3. 4.
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Solution
The correct option is D 1 & 3
E2 reaction is stereoselective. The elimination of Br and H occurs in anti-periplanar geometry. Thus, a leads to compound cis-2, 3-diphenylbut-2-en.
E2 reaction is stereoselective. The elimination of Br and H occurs in anti-periplanar geometry. Thus, a leads to compound cis-2, 3-diphenylbut-2-en.
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