Which of the following compounds are meso forms ?
$1$ only
$3$ only
$1$ and $2$
$2$ and $3$
How many optically active (Lactide) product $(s)$ are formed in given reaction ?
$\begin{array}{*{20}{c}}
{OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - CH - COOH\xrightarrow{\Delta }}
\end{array}$
Which one of the following is chiral ?
The isomeric deuterated bromide with molecular formula $C _4 H _8 DBr$ having two chiral carbon atoms is
The total number of acylic isomers including the stereoisomers with the molecular formula ${C_4}{H_7}Cl$