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Assertion : Complexes of $\mathrm{MX}_6$ and $\mathrm{MX}_5 \mathrm{~L}$ type ( $\mathrm{X}$ and L are unidentate) do not show geometrical isomerism.
Reason : Geometrical isomerism is not shown by complexes of coordination number 6 .
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Reason : Geometrical isomerism is not shown by complexes of coordination number 6 .
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The correct answer is:
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Complexes of $\mathrm{MX}_6$ and $\mathrm{MX}_5 \mathrm{~L}$ type ( $\mathrm{X}$ and $\mathrm{L}$ are unidentate) do not show geometrical isomerism due to presence of plane of symmetry and necessary condition for showing geometrical isomerism is that complex is must of $\mathrm{MA}_4 \mathrm{~B}_2$ type or $\left[\mathrm{M}(\mathrm{AB})_2 \mathrm{X}_2\right]$ type
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