Question

A diastereo-isomer of $\left(R\right)$ $4-$bromo-cis-$2$-hexene is:

• A. $\left(S\right)-4-$bromo-cis-$2$-hexene
• B. $\left(S\right)-5-$bromo-trans-$2$-hexene
• C. $\left(R\right)-4-$bromo-trans-$2$-hexene
• D. none of these

Answer 1

The correct option is C $\left(R\right)-4-$bromo-trans-$2$-hexene

Cis and trans compounds are diastereoisomer for (R) - 4 - Bromo cis - 2- hexene.

This can be written as

Cis configuration Bulky groups on the same side.

Trans configuration - Bulky groups on opposite sides.

Hence 4 - Bromotrans 2- hexene is diastereoisomer of 4 Bromo cis 2-Hexene.