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In te given reaction

[X] will be
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[X] will be
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The correct answer is:
Threo-2,3- dibromobutane
It is cis-but-2-ene which on reaction with (anti addition) give racemic mixture of product as follows

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

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