Complex $-$ Name
$\mathrm{Ni}^{+4} \rightarrow \mathrm{d}^{6}$ strong field ligand
$[image(1)]$
Pairing will be there zero unpaired electron
$\mathrm{NiCl}_{2} \rightarrow \mathrm{Ni}^{2+} \rightarrow \mathrm{d}^{8}$
$[image(2)]$
Change $=2$
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Reason : Red phosphorus consists of $P_4$ tetrahedral units linked to one another to form linear chains.
$\,\begin{array}{*{20}{c}}
{\,C{H_3} - \,CH - \,CH = C{H_2}\,\xrightarrow{{B{r_2}/aq.NaCl}}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$