Dipole moment will be zero in complexes I. [Ni(CN)_4]^ 2- II. cis-Pt(NH_3)_2Cl_2 III. trans-[Pt(NH_3)_2Cl_2]

JEE Advanced Chemistry question

Dipole moment will be zero in complexes I. II. cis-Pt(NH_3)_2Cl_2 III. trans-[Pt(NH_3)_2Cl_2]

(A)I and II
(B)I and IIICorrect
(C)II and III
(D)I,II and III

Answer: (B)

Solution

is square planar with all four identical ligands symmetrically arranged, so bond dipoles cancel — zero net dipole (I). In trans-[Pt(NH_3)_2Cl_2], the two groups are opposite each other and the two groups are opposite each other,

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Question ID VK-160021