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NEET2007ChemistryGeneral Organic ChemistryActual

Assertion : trans-butene on reaction with bromine forms racemic mixture. Reason : trans-compound in trans addition forms two types of stereoisomers.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

With trans-but-2-ene, the product of ( Br ₂ ) addition is optically inactive due to the formation of symmetric meso compounds. In general, for symmetrical alkenes and symmetrical reagents, the addition takes place as: ( gathered cis-alkene + syn-addition meso trans-alkene + syn-addition racemic cis-alkene + anti-addition racemic trans-alkene + anti-addition meso gathered )

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