- A

- B

- ✓

- D






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$X$ is

$(A)$ The acidity of compound $I$ is due to delocalization in the conjugate base.
$(B)$ The conjugate base of compound IV is aromatic.
$(C)$ Compound II becomes more acidic, when it has a $- NO _2$ substituent.
$(D)$ The acidity of compounds follows the order $I > IV > V > II > III$.
Compound $(X)$ $\xrightarrow[{Pt}]{{5{H_2}}}$
Compound $(X)$ $\xrightarrow{{AgN{O_3}}}$ Precipitate
Compound $(X)$ $\xrightarrow[{M{e_2}S}]{{{O_3}}}$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,O\,\,\,\,} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{H - C - C{H_2} - C{H_2} - C - C - H}
\end{array}$ $\begin{array}{*{20}{c}}
{\,\,O\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,} \\
{H - C - C - O - H}
\end{array}$ $ + \begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,} \\
{H - C - O - H}
\end{array}$ $ + \begin{array}{*{20}{c}}
{CHO} \\
{|\,\,\,\,\,\,\,\,} \\
{CHO}
\end{array}$