JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Coordination Compounds

The pair(s) of coordination complexes/ions exhibiting the same kind of isomerism is(are)

(A) $[C r (N H_{3})_{5} C l] C l_{2}$ and $[C r (N H_{3})_{4} C l_{2}] C l$
(B) $[C o (N H_{3})_{4} C l_{2}]^{+}$ and $[P t (N H_{3})_{2} (H_{2} O) C l]^{+}$ ✓ Correct
(C) $[C o B r_{2} C l_{2}]^{2 -}$ and $[P tB r_{2} C l_{2}]^{2 -}$
(D) $[P t (N H_{3})_{3} (N O_{3})] C l$ and $[P t (N H_{3})_{3} C l] B r$ ✓ Correct

Answer: (B), (D)

Solution

(B): Both

[C o (N H_{3})_{4} C l_{2}]^{+}

(

M a_{4} b_{2}

type) and

[P t (N H_{3})_{2} (H_{2} O) C l]^{+}

(

M a_{2} b c

type) can show geometrical isomerism (cis-trans).

(D): Both

[P t (N H_{3})_{3} (N O_{3})] C l

and

[P t (N H_{3})_{3} C l] B r

can show ionization isomerism (different ions inside and outside the coordination sphere).

(A) shows ionization isomerism only in the first complex.
(C) shows geometrical isomerism but the two complexes have different geometries (tetrahedral vs square planar).

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JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Coordination Compounds

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