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The type of isomerism exhibited by pentaamminenitrochromium(III) perchlorate is

1. Optical isomerism
2. Linkage isomerism
3. Hydrate isomerism
4. Geometrical isomerism

Correct answer: Linkage isomerism

Solution

The complex [Cr(NH3)5(NO2)](ClO4)2 contains the ambidentate ligand NO2⁻ (nitrite). It can bond to Cr via nitrogen (nitro mode, -NO2) or via oxygen (nitrito mode, -ONO), generating two distinct compounds with the same molecular formula but different bonding — this is linkage isomerism.

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