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Which one of the following complexes will have four isomers?

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$[C O {(e n)}_{3}] C l_{3}$

$[C O {(P P h_{3})}_{2} {(N H_{3})}_{2} C l_{2}]$

$[C O (e n) {(N H_{3})}_{2} C l_{2}] C l$

$[C O {(e n)}_{2} C l_{2}] B r$

answer is C.

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Detailed Solution

The complex $[C O (e n) {(N H_{3})}_{2} C l_{2}] C l$ has four isomers.

In one isomer, two ammonia ligands are trans to each other. In the other isomer, the chlorine ligands are trans to each other.

In the third isomer the ammonia ligands are cis to each other and chlorine ligands are also cis to each other. This is optically active and exists in d and l forms.

Thus, total four isomers are possible.

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