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Question

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

A
[M(AA)2]
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B
[M(AA)3]
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C
[MABCD]
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D
[MA3B3]
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Solution

The correct option is D [MA3B3]
The compounds of the formula [MA3B3] exhibit fac and mer isomerism.
The fac isomer is also known as facial isomer or cis isomer. Three A ligands are present on one triangular face and three B ligands are present on opposite triangular face.
The mer isomer is also known as meridional isomer or trans isomer.
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