Q. Which one of the following complex ions has geometrical isomers?
A) $\left\lbrack Co(en)_{3} \right\rbrack^{3 +}$
B) $\left\lbrack Ni\left( {NH}_{3} \right)_{5}Br \right\rbrack^{+}$
C) $\left\lbrack Co\left( {NH}_{3} \right)_{2}(en)_{2} \right\rbrack^{3 +}$
D) $\left\lbrack Cr\left( {NH}_{3} \right)_{4}(en) \right\rbrack^{3 +}$
Explanation
(c)
[table] | Complex | Isomerism shown ; (a) | $\left\lbrack Co(en) \right\rbrack^{3 +}$ | Optical only ; (b) | $\left\lbrack Ni\left( {NH}_{3} \right)_{5}Br \right\rbrack^{+}$ | No geometrical isomer ; (c) | $\left\lbrack Co\left( {NH}_{3} \right)_{2}(en)_{2} \right\rbrack^{3 +}$ | Cis and trans ; (d) | $\left\lbrack Cr\left( {NH}_{3} \right)_{4}(en) \right\rbrack^{3 +}$ | No geometrical isomer [/table]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.