
- ✓diastereomers
- Bracemic
- Csingle stereoisomer
- Dmeso

Two chiral carbons in the product. Configuration of one carbon is fixed. Attack on the carbonyl carbon can be from two sides. Hence products obtained will be diastereomers.
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[Given $pK _{ a }$ of $CH _{3} COOH =4.57$ ]
$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\,} \\
{\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,} \\
{C{H_3} - C - C{H_2} - C - CN} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$

$\overset{\left( II \right)}{\mathop{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}}\,$ $\overset{\left( II \right)}{\mathop{\left[ PtC{{l}_{4}} \right]}}\,$