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(D) The complex $[M(en)_{2}Cl_{2}]$ shows geometrical isomerism (cis and trans).In the trans isomer,the two $Cl$ atoms are at $180^{\circ}$ to each ot

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$II$ and $III$

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(D) The complex $[M(en)_{2}Cl_{2}]$ shows geometrical isomerism (cis and trans).In the trans isomer,the two $Cl$ atoms are at $180^{\circ}$ to each other,making the molecule centrosymmetric and optically inactive.In the cis isomer,the two $Cl$ atoms are at $90^{\circ}$ to each other,making the molecule chiral (lacking a plane of symmetry) and optically active.Looking at the structures:Structure $I$ is a trans isomer (optically inactive).Structure $II$ is a cis isomer (optically active).Structure $III$ is a cis isomer (optically active).Structure $IV$ is a trans isomer (optically inactive).Therefore,the optical isomers are the two cis forms,$II$ and $III$.

Of the following configurations,the optical isomers are

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