MCQ
Identify the product $(A)$


- A

- ✓

- C

- D$\begin{matrix}
O \\
||\,\, \\
Ph-C-N{{H}_{2}} \\
\end{matrix}$





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$HCHO\xrightarrow[{dil{H_2}S{O_4}}]{{NaCN}}A\xrightarrow[{\operatorname{P} t}]{{{H_2}}}B$ The product $(B)$ is