NEETChemistryCoordination Compounds
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The complex [ Pt ( NH ₃)₄]²⁺ exhibits geometrical isomerism whereas [ Pt ( NH ₃)₂ Cl ₂] does not. Reason (R) : Heteroleptic square planar complexes of the type MA ₂ B ₂ can show geometrical isomerism, while homoleptic square planar complexes cannot. In the light of the above statements, choose the
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
D. (A) is not correct but (R) is correct
Step-by-step solution
Assertion (A) is false. The complex [ Pt ( NH ₃)₄]²⁺ is a homoleptic square planar complex (type MA ₄ ). In such a complex, all four coordination positions are equivalent, so it cannot exhibit geometrical isomerism. Conversely, [ Pt ( NH ₃)₂ Cl ₂] is a heteroleptic complex (type MA ₂ B ₂ ) and it exhibits geometrical isomerism, existing as distinct cis and trans isomers. Reason (R) is true. Geometrical isomerism arises due to different possible spatial arrangements of ligands around the central metal. This is possi