- APrecipitate
- BSolution
- ✓Gelatin
- DComplex collagen
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$(I)$ the nature of the ligand
$(II)$ the charge on the metal ion
$(III)$ whether the metal is in the first, second or third row of the transition elements
$\begin{array}{*{20}{c}}
{{C_2}{H_5}MgBr + {H_2}C - C{H_2}\xrightarrow{{{H_2}O}}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\backslash \,\,\,\,/} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}A$
$\begin{array}{*{20}{c}}
{OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}CHC{H_2}C{H_2}N{H_2}}
\end{array}$ $\xrightarrow[{triethyla\min e}]{{ethyl\,formate\,\left( {1\,equiv} \right)}}$


$(A)$ $Q = KNO _2, W = LiAlH _4$
$(B)$ $R =$ benzenamine, $V = KCN$
$(C)$ $Q = AgNO _2, R =$ phenylmethanamine
$(D)$ $W = LiAlH _4, V = AgCN$