Question

Identify the compound showing linkage isomerism.

• A. $\left[C o \left(e n\right)_{3}\right]\left(C l\right)_{3}$
• B. $\left[C o \left(\left(N H\right)_{3}\right)_{6}\right]\left[C r \left(C N\right)_{6}\right]$
• C. $\left[\right.Co\left(e n\right)_{2}\left(N O\right)_{2}Cl\left]\right.Br$
• D. $\left[C o \left(\left(N H\right)_{3}\right)_{5} C l\right]\left(B r\right)_{2}$

Answer 1

Answer: (C)

$\left[\right.Co\left(e n\right)_{2}\left(N O\right)_{2}Cl\left]\right.Br$ exhibits linkage isomerism because the $N O_{2}$ group can exist as nitrito (-ONO) and nitro (- $N O_{2}$ ) group. The linkage isomers of $\left[\right.Co\left(e n\right)_{2}\left(N O\right)_{2}Cl\left]\right.Br$ are as $\left[\right.Co\left(e n\right)_{2}\left(N O\right)_{2}Cl\left]\right.Br \, and \, \left[\right.Co\left(e n\right)_{2}ONOCl\left]\right.Br$ .