MCQ
Considering the above reactions, the compound $'A'$ and compound $'B'$ respectively are


- A

- B

- ✓

- D







Whereas in $AgCN; \;Ag - C$ has covalent bond
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$\left. \begin{gathered}
(A)\,\,\xrightarrow{{PB{r_3}}}\,(C)\,\xrightarrow{{Mg\,,\,ether}}Grignard\,\,reagent \hfill \\
(A)\,\,\xrightarrow[{{H_2}S{O_4}}]{{N{a_2}C{r_2}{O_7}}}\,(B) \hfill \\
\end{gathered} \right\}$ $ \to \,(D)\xrightarrow{{{H_3}{O^ \oplus }}}$ $(3,4-$ dimethyl $3-$ hexanol$)$
$C{H_3}C{H_2}COOH\xrightarrow{{PC{l_3}}}I\xrightarrow[{AlC{l_3}}]{{{C_6}{H_6}}}II\xrightarrow[{base,heat}]{{N{H_2}N{H_2}}}III$ is
