The total possible coordination isomers for the following compounds respectively are:
$[C o (e n)_{3}] [C r (C_{2} O_{4})_{3}]$
$[C u (N H_{3})_{4}] [C u C l_{4}]$
$[N i (e n)_{3}] [C o (N O_{2})_{6}]$ .

4, 4, 4

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2, 2, 2

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2, 2, 4

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4, 2, 3

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Solution

The correct option is D $4, 2, 3$
The complex $[C o (e n)_{3}] [C r (C_{2} O_{4})_{3}]$ has four possible coordination isomers.
They are $[C o (e n)_{3}] [C r (C_{2} O_{4})_{3}], [C o (C_{2} O_{4}) (e n)_{2}]$ and
$[C r (C_{2} O_{4})_{2} (e n)], [C r (C_{2} O_{4}) (e n)_{2}] [C o (C_{2} O_{4})_{2} (e n)], [C r (e n)_{3}] [C o (C_{2} O_{4})_{3}]$ .

The complex $[C u (N H_{3})_{4}] [C u C l_{4}]$ has two possible coordination isomers. They are $[C u (N H_{3})_{4}] [C u C l_{4}], [C u C l (N H_{3})_{3}] [C u C l_{3} (N H_{3})]$ .

The complex $[N i (e n)_{3}] [C o (N O_{2})_{6}]$ has four possible coordination isomers.
They are $[N i (e n)_{3}] [C o (N O_{2})_{6}], [N i (N O_{2})_{2} (e n)_{2}] [C o (N O_{2})_{4} (e n)]$ and $[C o (N O_{2})_{2} (e n)_{2}] [N i (N O_{2})_{4} (e n)], [C o (e n)_{3}] [N i (N O)_{2})_{6}]$ .

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Similar questions

[C u {(N H_{3})}_{4}] [P t C l_{4}]

[C u (N H_{3})_{4}] [P t C l_{4}]

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