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Question:

The correct statement on the isomerism associated with the following complex ions is: (a) [Ni(H2O)5NH3]2+ (b) [Ni(H2O)4(NH3)2]2+ (c) [Ni(H2O)3(NH3)3]2+

Both (a) and (b) shows geometrical isomerism

(a) shows geometrical isomerism and (b) shows optical isomerism

Both (b) and (c) shows geometrical isomerism

(b) shows geometrical isomerism and (c) shows optical isomerism

Solution:

(a) [Ni(H2O)5NH3]2+ neither shows geometrical isomerism nor shows optical isomerism (b) [Ni(H2O)4(NH3)2]2+ shows cis-trans isomerism and (c) [Ni(H2O)3(NH3)3]2+ shows fac-mer isomerism which is nothing but geometrical isomers. Thus, (b) and (c) shows geometrical isomerism.