Which of the following compound has plane of symmetry ?

$\begin{array}{*{20}{c}}
{R =  - CH - Cl}\\
{|\,\,}\\
{\,\,\,\,C{H_3}}
\end{array}\,\,\,\,,\,\,\,\,\,\,\,\,\,\,\begin{array}{*{20}{c}}
{S =  - CH - Cl}\\
{|\,\,}\\
{Br}
\end{array}$

Which of the following compounds is optically active

Which of the following are meso compound?

Which of the following pair are metamer ?

From the above compound $(A), (B), (C)$ & $(D)$ chiral compound is

Find the sum of all the stereocenters that are present in below compounds