$(a)$ $\underset{(no\,\,\alpha -H)}{\mathop{\begin{matrix}
\,\,\,\,\,\,\,\,\,\,\,O \\
\,\,\,\,\,\,\,\,\,\,\,|| \\
C{{l}_{3}}\overset{\alpha }{\mathop{C}}\,CH \\
\end{matrix}}}\,$ $(b)$ $\underset{(\alpha -H)}{\mathop{{{C}_{6}}{{H}_{5}}\overset{\alpha }{\mathop{C}}\,{{H}_{2}}CHO}}\,$
$(c)$ $\underset{(\alpha -H)}{\mathop{{{C}_{4}}{{H}_{9}}\overset{\alpha }{\mathop{C}}\,{{H}_{2}}CHO}}\,$ $(d)$ $CH_3NO_2$


$\underset{({{C}_{2}}{{H}_{6}}O)}{\mathop{X}}\,\,\xrightarrow[573\,\,K]{Cu}$ $A$ $\xrightarrow[^{-}OH\,,\,\Delta ]{{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}}$ Silver mirror
$A\,\xrightarrow{^{-}OH\,,\,\Delta }Y$
$A\,\xrightarrow{N{{H}_{2}}NHCON{{H}_{2}}}Z$
