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Question: Answered & Verified by Expert
In te given reaction

[X] will be
ChemistrySolutionsNEET
Options:
  • A Erythro-2,3-dibromobutane
  • B Threo-2,3- dibromobutane
  • C 1 : 1 mixture of Erythro-2,3-dibromo butane and threo-2,3-dibromobutane
  • D 2 : 1 mixture of erythro-2,3-dibromobutane and threo-2,3-dibromobutane
Solution:
1912 Upvotes Verified Answer
The correct answer is: Threo-2,3- dibromobutane
It is cis-but-2-ene which on reaction with Br2 (anti addition) give racemic mixture of product as follows

These dibromo derivatives are threo forms as the Br-groups are in anti forms.

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