The reaction of propane with bromine in presence of UV light predominantly forms

Which of the following pair of compounds on heating gives butanenitrile?

Standard potential $\left(\mathrm{E}^{\circ}\right)$ of $\mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}_{(\mathrm{s})}$ is -0.76 V .

What is standard potential of reaction $2 \mathrm{Zn}_{(\mathrm{s})} \longrightarrow 2 \mathrm{Zn}_{(\mathrm{aq})}^{+2}+4 \mathrm{e}^{-}$?

Identify the ligands present in cisplatin.