Question
Write all the possible isomers of $[Co(NH_3)_5(SCN)]Cl$.

Answer

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5(\mathrm{SCN})\right] \mathrm{Cl},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5(\mathrm{NCS})\right] \mathrm{Cl},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{SCN},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{NCS}$.
$MA_5B$ type complexes do not show geometrical or optical isomerism.

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