Consider the complex ions,
trans-\(\mathrm{[Co(en)_2Cl_2]^{+}}\) (A) and
cis-\(\mathrm{[Co(en)_2Cl_2]^{+}}\) (B).
The correct statement regarding them is :
trans-\(\mathrm{[Co(en)_2Cl_2]^{+}}\) (A) and
cis-\(\mathrm{[Co(en)_2Cl_2]^{+}}\) (B).
The correct statement regarding them is :
Show Hint
- both (A) and (B) can be optically active.
- both (A) and (B) can not be optically active.
- (A) can not be optically active, but (B) can be optically active.
- (A) can be optically active, but (B) can not be optically active.
The Correct Option is C
Solution and Explanation
trans-isomer (A): the two Cl ligands are on opposite (axial) positions and both en rings lie in the equatorial plane. The equatorial plane is a plane of symmetry, so (A) is achiral and optically inactive.
cis-isomer (B): the two Cl ligands are adjacent. It has no plane or centre of symmetry, and its mirror image cannot be superimposed on it. It exists as a pair of enantiomers (\(\Delta\) and \(\Lambda\)), so (B) can be optically active.
Therefore (A) cannot be optically active but (B) can.
Answer: (3) (A) can not be optically active, but (B) can be optically active.
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