Complex X of composition Cr(H2O)6Cln has a spin only magnetic moment of 3.83 BM. It reacts with AgNO3 and shows geometrical isomerism. The IUPAC nomenclature of X is :
Solution
Given complex Cr(H<sub>2</sub>O)<sub>6</sub>Cl<sub>n</sub>
<br><br>As the magnetic mement is 3.83 BM then
<br><br>Spin only magnetic moment = $\sqrt {n\left( {n + 2} \right)}$ BM = 3.83
<br><br>$\Rightarrow$ n = 3
<br><br>Chromium
in +3 oxidation state so molecular formula is
Cr(H<sub>2</sub>O)<sub>6</sub>Cl<sub>n</sub>.
<br><br>$\therefore$ This formula have following isomers
<br><br>(a) [Cr(H<sub>2</sub>O)<sub>6</sub>]Cl<sub>3</sub> : react with AgNO<sub>3</sub> but does
not show geometrical isomerism.
<br><br>(b) [Cr(H<sub>2</sub>O)<sub>5</sub>Cl]Cl<sub>2</sub>.H<sub>2</sub>O react with AgNO<sub>3</sub> but
does not show geometrical isomerism.
<br><br>(c) [Cr(H<sub>2</sub>O)<sub>4</sub>Cl<sub>2</sub>]Cl.2H<sub>2</sub>O react with AgNO<sub>3</sub> &
show geometrical isomerism.
<br><br>(d) [Cr(H<sub>2</sub>O)<sub>3</sub>Cl<sub>3</sub>].3H<sub>2</sub>O does not react with
AgNO<sub>3</sub> & show geometrical isomerism.
<br><br>Compound will be
[Cr(H<sub>2</sub>O)<sub>4</sub>Cl<sub>2</sub>] Cl.2H<sub>2</sub>O
<br><br>IUPAC NAME : Tetraaquadichlorido chromium(III) chloride dihydrate
About this question
Subject: Chemistry · Chapter: Coordination Compounds · Topic: Ligands and Coordination Number
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