Which of the following complexes can exist as diastereoisomers?

[C r (N H_{3})_{2} C l_{4}]^{-}

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[C o (N H_{3})_{5} B r]^{2 +}

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[F e C l_{2} (N C S)_{2}]^{2 -}

(tetrahedral)

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[P t C l_{2} B r_{2}]^{2 -}

(square planar)

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Solution

The correct option is D $[P t C l_{2} B r_{2}]^{2 -}$ (square planar)
The complex $[P t C l_{2} B r_{2}]^{2 -}$ (square planar) can exist as diastereoisomers.
It exists in cis form and trans form. Diastereomerism occurs when two or more stereoisomers of a compound have different configurations at one or more (but not all) of the equivalent (related) stereocenters and are not mirror images of each other.

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[P t (N H_{3})_{4}]^{2 +} [C o (S C N)_{4}]^{2 -} [C u (e n)_{2}]^{2 +} [H g I_{4}]^{2 -}

N i^{2 +}, P t^{2 +}

Z n^{2 +},

The geometries of the ammonia complexes of $N i^{2 +}, P t^{2 +} a n d Z n^{2 +},$ respcetively, are

[N i (C N)_{4}]^{2 -}

{[C o I_{4}]}_{4}^{2 -}

{[P d B r_{4}]}_{4}^{2 -}

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