The type of isomerism present in Nitropentamminechromium(III) chloride is
optical
linkage
Co-ordination
polymerisation.
As we have learnt,
is an ambidentate ligand and can be attached from both the N site as well as the O site in the form of and respectively.
Hence, the given complex can show Linkage isomerism
Therefore, option (2) is correct.