Question

Match the following:

List-I (Complex)	List-II (Isomerism)
A) [Co(NH3)5Br]SO4	V) Ionization
B) [Co(en)3]3+	I) Optical
C) [Co(NH3)5(NO2)]2+	II) Linkage
D) [Co(NH3)3Cl3]	III) Geometrical

• A. A-V, B-II, C-I, D-III
• B. A-II, B-I, C-V, D-III
• C. A-V, B-I, C-II, D-III
• D. A-III, B-I, C-IV, D-II

Hint:

Linkage isomerism involves ambidentate ligands like NO$_2^-$; optical isomerism arises in chiral complexes; geometrical isomerism exists in planar or octahedral complexes; ionization isomerism arises from exchange of counterions.

Answer 1

The Correct Option is C

\begin{itemize} \item A) [Co(NH$_3$)$_5$Br]SO$_4$ and [Co(NH$_3$)$_5$SO$_4$]Br show ionization isomerism $\Rightarrow$ V \item B) [Co(en)$_3$]$^{3+}$ is optically active due to chiral complex $\Rightarrow$ I \item C) [Co(NH$_3$)$_5$(NO$_2$)]$^{2+}$ shows linkage isomerism as NO$_2^-$ can bind via N or O $\Rightarrow$ II \item D) [Co(NH$_3$)$_3$Cl$_3$] can have cis and trans forms $\Rightarrow$ III \end{itemize}