Identify the incorrect statement.

Options

1. AThe transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
2. BInterstitial compounds are those that are formed when small atoms like $H, C$ or $N$ are trapped inside the crystal lattices of metals.
3. CThe oxidation states of chromium in ${CrO}_{4}^{2 -}$ and ${Cr}_{2}{O}_{7}^{2 -}$ are not the same.
4. D${Cr}_{2} + \left({d}^{4}\right)$ is a stronger reducing agent than ${Fe}^{2 +} + \left({d}^{6}\right)$ in water.