Question

What types of isomer are $\left[Co\right(N{H}_3{)}_{5}Br]S{O}_4$ and $\left[Co\right(N{H}_3{)}_{5}S{O}_4]Br$?

Answer 1

$\left[Co\right(N{H}_3{)}_{5}Br]S{O}_4$ and $\left[Co\right(N{H}_3{)}_{5}S{O}_4]Br$ are ionisation isomers. In aqueous solution, they undergo dissociation to form different ions.
$\left[Co\right(N{H}_3{)}_{5}Br]S{O}_4$ on dissociation in aqueous solution gives $\left[Co\right(N{H}_3{)}_{5}Br{]}^{2+}$ and $S{O}_4^{2-}$ ions.
$\left[Co\right(N{H}_3{)}_{5}Br]S{O}_4\to [Co(N{H}_3{)}_{5}Br{]}^{2+}+S{O}_4^{2-}$
Whereas $\left[Co\right(N{H}_3{)}_{5}S{O}_4]Br$ on dissociation in aqueous solution gives $\left[Co\right(N{H}_3{)}_{5}S{O}_4{]}^{+}$ and $B{r}^{-}$ ions.
$\left[Co\right(N{H}_3{)}_{5}S{O}_4]Br\to [Co(N{H}_3{)}_{5}S{O}_4{]}^{+}+B{r}^{-}$