$\left.\left[\mathrm{CoNH}_3\right)_4\left(\mathrm{NO}_2\right)_2\right] \mathrm{Cl}$ exhibits

1. linkage isomerism, geometrical isomerism and optical isomerism
2. linkage isomerism, ionization, isomerism and optical isomerism
3. linkage isomerism, ionization isomerism and geometrical isomerism
4. ionization isomerism, geometrical isomerism and optical isomerism

Solution

The compound $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{NO}_2\right)_2\right]$ $\mathrm{Cl}$ exhibits linkage, ionisation and geometrical isomerism. Linkage isomers: $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{NO}_2\right)_2\right]$ $\mathrm{Cl}$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4(\mathrm{ONO})_2\right] \mathrm{Cl}$ Ionisation isomers: $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{NO}_2\right)_2\right]$ $\mathrm{Cl}$ and $\left.\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{NO}_2\right) \mathrm{Cl}\right)\right] \mathrm{NO}_2$

Asked in: NEET 2006

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