Among the following compounds I - IV , which one forms a yellow precipitate on reacting sequentially with…

Only in  ${\mathrm{I}}^{-}$ can be substituted by ${\mathrm{OH}}^{-}$, ${\mathrm{I}}^{-}$ combine with ${\mathrm{Ag}}^{+}$ to form a yellow precipitate of $\mathrm{AgI}$. While

in $\mathrm{I}, \mathrm{II}$ and $\mathrm{III}$ substitution reaction is not possible due to partial double bond character.