- AMethyl alcohol
- ✓Ethyl amine
- CDimethyl amine
- DDiethyl amine

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Note: py $=$ pyridine
Given: Atomic numbers of $Fe , Co , Ni$ and $Cu$ are $26,27,28$ and $29$ , respectively)
$(A)$ $\left[ FeCl _4\right]^{-}$and $\left[ Fe ( CO )_4\right]^{2-}$
$(B)$ $\left[ Co ( CO )_4\right]^{-}$and $\left[ CoCl _4\right]^{2-}$
$(C)$ $\left[ Ni ( CO )_4\right]$ and $\left[ Ni ( CN )_4\right]^{2-}$
$(D)$ $\left[ Cu ( py )_4\right]^{+}$and $\left[ Cu ( CN )_4\right]^{3-}$
$\begin{matrix}
{{O}_{3}}/Zn \\
(1) \\
\end{matrix}\,\,\,\,\,\,\,\,\,\,\begin{matrix}
EtONa/EtOH/\Delta \\
(2) \\
\end{matrix}\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
NaOCl \\
(3) \\
\end{matrix}\,\,\,\,\,\,\,\,\,\begin{matrix}
{{H}^{+}} \\
(4) \\
\end{matrix}$