Identify the incorrect statement from the following:

1. A. Oxygen exhibits only -2 oxidation state.
2. B. The order of catenation property of Group 14 elements is C >> Si > Ge ≈ Sn.
3. C. Carbon has the ability to form pπ-pπ multiple bond with itself.
4. D. ECl3 (E = B and Al) is a monomer when E = B and a dimer when E = Al.

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