Assertion (A) : The total number of geometrical isomers shown by [Co(en)2Cl2]+[Co(en)2Cl2]+complex ion is three.Reason (R): [Co(en)2Cl2]+[Co(en)2Cl2]+complex ion has an octahedral geometry.In the light of the above statements, choose the most appropriate answer from the options given below :JEE Main 2024 (09 Apr Shift 1)ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)B(A) is not correct but (R) is correctCBoth (A) and (R) are correct and (R) is the correct explanation of (A)D(A) is correct but (R) is not correct

The answer is (A). Both (A) and (R) are correct but (R) is not the correct explanation of (A).

Here's why:

Assertion (A) is correct. The complex ion [Co(en)2Cl2]+ does indeed show three geometrical isomers. This is because the two ethylenediamine (en) ligands and two chloride (Cl) ligands can arrange themselves in different ways around the cobalt (Co) atom.

Reason (R) is also correct. The complex ion [Co(en)2Cl2]+ does have an octahedral geometry. This is because there are six coordination sites around the cobalt atom, which are occupied by the two bidentate ethylenediamine ligands and two chloride ligands.

However, (R) is not the correct explanation of (A). The number of geometrical isomers of a complex ion is determined by the arrangement of its ligands, not its overall geometry. Even though the complex ion has an octahedral geometry, the specific arrangement of the ethylenediamine and chloride ligands is what gives rise to its three geometrical isomers.