In te given reaction [X] will be

Question

In te given reaction <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/c-xrm1huazi7ycuaqf.jpg" /> [X] will be (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

Tardigrade Admin · Accepted Answer

It is cis-but-2-ene which on reaction with Br2 (anti addition) give racemic mixture of product as follows <img class="img-fluid question-image" alt="Solution" src="https://cdn.tardigrade.in/q/nta/c-xrm1huazi7ycjnpl.jpg" /> These dibromo derivatives are threo forms as the Br-groups are in anti forms.

Q. In te given reaction

[X] will be

Erythro-2,3-dibromobutane

Threo-2,3- dibromobutane

1 : 1 mixture of Erythro-2,3-dibromo butane and threo-2,3-dibromobutane

2 : 1 mixture of erythro-2,3-dibromobutane and threo-2,3-dibromobutane

It is cis-but-2-ene which on reaction with $B r_{2}$ (anti addition) give racemic mixture of product as follows

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

Q. In te given reaction [X] will be