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JEE Main levelSingle correct optionDifficulty 2 of 3o2184

Cyclopentene reacts with in water. Which description of the product is correct?

  1. Aa single enantiomer of cis-2-bromocyclopentan-1-ol, optically active
  2. Bracemic trans-2-bromocyclopentan-1-ol
  3. Cracemic cis-2-bromocyclopentan-1-ol
  4. Da single enantiomer of trans-2-bromocyclopentan-1-ol, optically active

Answer: B

Anti addition through the bromonium ion gives the trans product. The bromonium ion forms on either face with equal probability, so both enantiomers form equally. The product is racemic and optically inactive.
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