The complex(es), which can exhibit the type of isomerism shown by [ Pt ( NH 3 ) 2 Br 2 ] , is(are) [en = H 2 NCH 2 CH 2 NH 2 ]

[ Cr ( en ) 2 ( H 2 O ) ( SO 4 ) ] +

Chemistry · Coordination Compounds

JEE Advanced 2023 — Paper 2 — Question 29

The complex(es), which can exhibit the type of isomerism shown by $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Br}_{2}\right]$ , is(are) [en $=\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$ ]

Option A:
$\left[\mathrm{Pt}(\mathrm{en})(\mathrm{SCN})_{2}\right]$
Option B:
$\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$
Option C:
$\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{4}\right]$
Correct
Option D:
$\left[\mathrm{Cr}(\mathrm{en})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)\left(\mathrm{SO}_{4}\right)\right]^{+}$
Correct

Answer: C, D

Step-by-step solution

$\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Br}_{2}\right]$ is a square planar complex. The given compound can show geometrical isomerism (cis-trans form) Option (A) : $\left[\operatorname{Pt}(\mathrm{en})(\mathrm{SCN})_{2}\right]$ cannot show geometrical isomerism. Option (B) : $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ is a tetrahedral complex, cannot show geometrical isomerism. Option (C) : $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{4}\right]$ is a octahedral complex, can show geometrical isomerism.

Option (D) : $\left[\mathrm{Cr}(\mathrm{en})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)\left(\mathrm{SO}_{4}\right)\right]^{+}$ is octahedral complex and is of type $\left[\mathrm{M}(\mathrm{AA})_{2} \mathrm{bc}\right]$ , can show

geometrical isomerism.

Answer key and solution verified before publishing.

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Exam: JEE Advanced 2023
Paper: Paper 2
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Isomerism in Coordination Compounds