JEE Advanced 2011 Chemistry question
The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is
Answer: 5
Solution
In 3-bromo-3-cyclopentylhexane, C-3 carries Br, an ethyl group (C1–C2), a propyl group (C4–C6) and a cyclopentyl group. Elimination can remove a β-hydrogen from three different carbons. (1) From C-2: the alkene (3-cyclopentylhex-2-ene). C-2 has and H, and C-3 has
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