Q. Which of the following compounds exhibit linkage isomerism?
A) $\left\lbrack Co(en)_{3} \right\rbrack{Cl}_{3}$
B) $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Cr(CN)_{6} \right\rbrack$
C) $\lbrack Co(en)_{2}{NO}_{2}Cl\rbrack Br$
D) $\left\lbrack Co\left( {NH}_{3} \right)_{5}Cl \right\rbrack{Br}_{2}$
Explanation
(c)
$\lbrack Co(en)_{2}{NO}_{2}Cl\rbrack Br$ exhibits linkage isomerism because the ${NO}_{2}$ group can exist as nitrito (—ONO) and nitro (—${NO}_{2}$) group. The linkage isomers of $\lbrack Co(en)_{2}{NO}_{2}Cl\rbrack Br$ are as $\lbrack Co(en)_{2}{NO}_{2}Cl\rbrack Br\ and\ \lbrack Co(en)_{2}ONOCl\rbrack Br$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.