MCQ
The configuration at $C-2$ and $C-3$ of the compound given


- A$2R, 3S$
- B$2S, 3R$
- ✓$2S, 3S$
- D$2R, 3R$


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$\begin{array}{*{20}{c}}
{C{H_3}C{H_2} - N - C{H_2}C{H_3}} \\
{|\,} \\
{C{H_3}}
\end{array}$
is :