Question

Total number of space isomers of the formula of the above complex is :

• A. $2$
• B. $3$
• C. $4$
• D. $1$

Answer 1

Answer: (B)

$3$

Loss of water on treatment with sulfuric acid indicates presence of water molecule in the ionization sphere.
Yellow precipitate of AgI on treatment with silver nitrate indicates presence of the iodide ion in the ionization sphere.
Thus the complex is $\left[Co\right(en{)}_{2}C{l}_2\left]\right(H_{2}O)I$.
Two geometrical isomers cis and trans are possible.
Cis isomer is optically active and exists in d and l forms.
Trans isomer is optically inactive .
Thus total three steroisomers are possible.