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JEE Main · 2017 · 02 Apr 2017 · Offline · Haloalkanes and Haloarenes

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The major product obtained in the following reaction is: [PhCHBr-CH₂Ph treated with tBuOK — structure in source]
  1. (A)C₆H₅CH=CHC₆H₅ (trans-stilbene)✓ Correct
  2. (B)[structure - refer to source PDF]
  3. (C)C₆H₅CH(OtBu)CH₂C₆H₅
  4. (D)[structure - refer to source PDF]

Answer: (A)

Solution

undergoes E2 elimination with the strong, bulky base . Anti-periplanar loss of HBr forms the alkene, and the more stable, less hindered isomer predominates, giving -stilbene (trans-stilbene), .

JEE Main · 2017 · 02 Apr 2017 · Offline · Single correct option

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