Number of stereoisomers possible for the complexes, [ CrCl 3 ( py ) 3 ] and [ CrCl 2 ( Ox ) 2 ] 3- are respectively (py = pyridine, ox = oxalate)

Chemistry · Coordination Compounds

JEE Main 2025 — 4 April, Morning Shift — Question 9

Number of stereoisomers possible for the complexes, $\left[\mathrm{CrCl}_{3}(\mathrm{py})_{3}\right]$ and $\left[\mathrm{CrCl}_{2}(\mathrm{Ox})_{2}\right]^{3-}$ are respectively (py = pyridine, ox = oxalate)

Option A:
$2 \& 2$
Option B:
$1 \& 2$
Option C:
$2 \& 3$
Correct
Option D:
$3 \& 3$

Answer: C

Step-by-step solution

$\left[\mathrm{CrCl}_{3}(\text { py })_{3}\right] \Rightarrow$ facial and meridional, 2 isomers (stereoisomers) possible.

$\left[\mathrm{CrCl}_{2}(\mathrm{Ox})_{2}\right] \Rightarrow 3$ isomers (2 geometrical $\rightarrow$ cis/trans).

The cis isomer also has an optical isomer so, total 3 isomers possible.

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Exam: JEE Main 2025
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Isomerism in Coordination Compounds

Which one of the following complexes will have Delta o=0 and mu=5.96 B.M?

Answer: C

Step-by-step solution

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