Identify the incorrect statement from the following:
- AOxygen exhibits only $-2$ oxidation state.
- BThe order of catenation property of Group $14$ elements is $C \gg Si > Ge \approx Sn$.
- CCarbon has the ability to form $p\pi-p\pi$ multiple bonds with itself.
- D$ECl_3$ ($E = B$ and $Al$) is a monomer when $E = B$ and a dimer when $E = Al$.
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