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

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2,2,2

2,2,4

4,2,4.

4,4,4

answer is D.

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Detailed Solution

1) $\begin{array}{l} [C o {(e n)}_{3}] [C r {(o x)}_{3}], \\ [C o {(e n)}_{2} (o x)] [C r {(o x)}_{2} (e n)] \\ [C r (o x) {(e n)}_{2}] [C o {(o x)}_{2} e n] \\ [C r {(e n)}_{3}] [C o {(o x)}_{3}] \end{array}$

2) $\begin{array}{l} [C u {(N H_{3})}_{4}] [C u C l_{4}] \\ [C u {(N H_{3})}_{3} C l] [C u (N H_{3}) C l_{3}] \end{array}$

3) $\begin{array}{l} [C r {(e n)}_{3}] [C o {(N O_{2})}_{6}] \\ [C r {(e n)}_{2} {(N O_{2})}_{2}] [C o (e n) {(N O_{2})}_{4}] \\ [C o {(e n)}_{2} {(N O_{2})}_{2}] [C r (e n) {(N O_{2})}_{4}] \\ [C o {(N O_{2})}_{6}] [C r {(e n)}_{3}] \end{array}$