Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Complexes of MX₆, and MX₅L type (X and L are unidentate ligands) do not show geometrical isomerism.
Reason (R):	Geometrical isomerism is not shown by complexes of coordination number 6.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: MX₆ and MX₅L contains an element of symmetry

Complexes of ${MX}_{6}$ and ${MX}_{5L}$ type (X and L are unidentate) do not show geometrical isomerism due to the presence of a plane of symmetry and the necessary condition for showing geometrical isomerism is that complex is a must of $M A_{4} B_{2} t y p e o r [M {(A B)}_{2}]$ type.

This type of isomerism arises in heteroleptic complexes due to different possible geometric arrangements of the ligands. Important examples of this behavior are found with coordination numbers 4 and 6.

Hence, Assertion is true but the reason is false.

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