Question

The correct configuration assigned for compounds $\left(I\right)$ and $\left(II\right)$ respectively are:

• A. $R,R$
• B. $S,S$
• C. $R,S$
• D. $S,R$

Answer 1

Answer: (A)

$R,R$

The correct configuration assigned for compounds (I) and (II) respectively are $R,R$.

In case of compound (I), the order of priority is $-OH>-COOH>-C{H}_3>-H$.

The lowest priority group is on the left-hand side and the order of rotation is anticlockwise. This results in $R$ configuration.

In case of compound (II), the order of priority is $-Br>-OH>-C{H}_{2}C{H}_3>-C{H}_2$

The lowest priority group is below the plane of the paper and the order of rotation is clockwise. This leads to $R$ configuration.

Option A is correct.