The possible number of structural and stereo isomers for the complex M B r 2 C l 2 S O 4 is

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The compound also shows ionization isomerism. The ionization isomers are
(i) $[M B r_{2} (S O_{4})] C l_{2}$
(ii) $[M C l_{2} (S O_{4})] B r_{2}$
(iii) $[M B r C l (S O_{4})] B r C l$
The complex ion $[M B r_{2} C l_{2}]^{2 +}$ shows geometrical isomerism.
The geometrical isomers are
(i) cis- $[M B r_{2} C l_{2}] S O_{4}$
(ii) trans- $[M B r_{2} C l_{2}] S O_{4}$
Thus, a total of five (3 structural and 2 geometrical) isomers are formed.

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