JEE PYQ: General Organic Chemistry Question 31
Question 31 - 2020 (09 Jan Shift 1)
Complex X of composition $\text{Cr}(\text{H}_2\text{O})_6\text{Cl}_n$ has a spin only magnetic moment of 3.83 BM. It reacts with $\text{AgNO}_3$ and shows geometrical isomerism. The IUPAC nomenclature of X is:
(1) Hexaaqua chromium (III) chloride
(2) Tetraaquadichlorido chromium (IV) chloride dihydrate
(3) Dichloridotetraaqua chromium (IV) chloride dihydrate
(4) Tetraaquadichlorido chromium (III) chloride dihydrate
Show Answer
Answer: (4)
Solution
$\mu = \sqrt{n(n+2)}$ B.M. = 3.83 B.M. So $n = 3$ ($n$ = No. of unpaired $e^-$). Therefore, oxidation number of Cr should be +3. Hence complex is $\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2$. Complex shows geometrical isomerism therefore formula of complex is $[\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot 2\text{H}_2\text{O}$. IUPAC Name: Tetraaquadichlorido chromium(III) Chloridedihydrate.
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