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Q. The compound(s) that exhibit(s) geometrical isomerism or optical isomerism or both is(are):

Coordination Compounds

Solution:

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(B) $\left[ Pt \left( NH _{3}\right)_{2}( CN )_{2}\right]: Pt$ is in +2 oxidation state having $5 d ^{8}$ configuration. Hence the hybridisation of complex is $dsp ^{2}$ and geometry is square planar.

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(C) $\left[ NiCl _{2} Br _{2}\right]^{2-}=$ tetrahedral, no GI, no optical isomerism