Question

Which of the following complexes shows geometrical isomerism?

• A. [Co(NH\textsubscript{3})\textsubscript{6}]\textsuperscript{3+}
• B. [Co(NH\textsubscript{3})\textsubscript{5}Cl]\textsuperscript{2+}
• C. [Co(NH\textsubscript{3})\textsubscript{4}Cl\textsubscript{2}]\textsuperscript{+}
• D. [Co(NH\textsubscript{3})\textsubscript{5}(ONO)]\textsuperscript{2+}

Hint:

Geometrical isomerism is typically observed in octahedral or square planar complexes with two or more different ligands.

Answer 1

The Correct Option is C

Geometrical isomerism occurs in coordination complexes when different ligands are attached to the central metal atom in different spatial arrangements. In the complex [Co(NH\textsubscript{3})\textsubscript{4}Cl\textsubscript{2}]\textsuperscript{+}, the two chloride ions can be placed either cis or trans relative to each other, resulting in geometrical isomerism.