Phosphorus pentachloride in the solid exists as

$(1)$ $\begin{matrix}
C{{H}_{3}} \\
|\,\,\,\,\,\, \\
ZNH\,C\,HC{{O}_{2}}H \\
\end{matrix}$ $(2)$ $\begin{matrix}
C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{H}_{2}}N\,C\,HC{{O}_{2}}C{{H}_{2}}{{C}_{6}}{{H}_{5}} \\
\end{matrix}$

$(3)$ $\begin{matrix}
\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}{{C}_{6}}{{H}_{5}} \\
|\,\,\,\,\, \\
ZNH\,C\,HC{{O}_{2}}H \\
\end{matrix}$ $(4)$ $\begin{matrix}
C{{H}_{2}}{{C}_{6}}{{H}_{5}}\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{H}_{2}}N\,CHC{{O}_{2}}C{{H}_{2}}{{C}_{6}}{{H}_{5}} \\
\end{matrix}$

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Which of the following compound does not give oxyacid of central atom on hydrolysis ?

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$\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}$ $\xrightarrow{{{I}_{2}}/NaOH}\underset{\begin{smallmatrix}
yellow\,\,compound \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,+
\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(B)
\end{smallmatrix}}{\mathop{(A)}}\,$ $\xrightarrow[\Delta ]{{Ag - powder}}(C)$ $\xrightarrow{{Dil\,\,{H_2}S{O_4}/HgS{O_4}}}(D)$

$A, C$ and $D$ are :-

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Ethyl acetoacetate when reacts with one mole methyl magnesium iodide then product of reaction will be

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Which of the following is an incorrect statement?

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What will be the reduction potential of $Cu$ in aqueous solution with $pH = 12$ ? If $K_{sp}$ of $Cu(OH)_2$ is $1\times10^{-19}$ and $E_{C{u^{ + 2}}/Cu}^o = 0.34\,V$ ............. $\mathrm{V}$

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