Fac and Mer isomerism is associated with which of the following general formula?

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[MABCD]

$[M {(AA)}_{2}]$

$[M {(AA)}_{3}]$

$[{MA}_{3} B_{3}]$

answer is D.

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Detailed Solution

When three ligands and the metal are in one plane, the isomer is said to be meridional, or mer.It contains both trans and cis pair hence,it is also considered as a combination on trans and cis. [Co(NH₃)₃(NO₂)₃] show fac and mer isomers.

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