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(A) Step $1$: Identify the general formula $MA_4BC$. Here, $M$ is the central metal atom, $A$ is a monodentate ligand present in $4$ units, and $B$ an

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$[Pt(NH_3)_4 ClBr]^{2+}$

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(A) Step $1$: Identify the general formula $MA_4BC$. Here, $M$ is the central metal atom, $A$ is a monodentate ligand present in $4$ units, and $B$ and $C$ are two different monodentate ligands.Step $2$: Analyze the options. Option $A$ is $[Pt(NH_3)_4 ClBr]^{2+}$. Here, $M = Pt$, $A = NH_3$ ($4$ units), $B = Cl$, and $C = Br$. This matches the $MA_4BC$ type.Step $3$: Diastereoisomers (geometric isomers) for $MA_4BC$ type complexes exist in two forms: $cis$ (where $B$ and $C$ are adjacent) and $trans$ (where $B$ and $C$ are opposite).Step $4$: Therefore, $[Pt(NH_3)_4 ClBr]^{2+}$ can exhibit geometric isomerism.

Which of the following complexes is an example of the type $MA_4BC$ diastereoisomers?

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