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Select the statement that is incorrect concerning the three isomers (compounds 1 – 3) shown below.

(A) Compound 1 is the most stable compound.

(B) Compound 3 has the largest HUMO-LUMO gap.

(C) Compound 3 is not considered a conjugated compound.

(D) The heat of hydrogenation of compound 2 will be smaller than that of compound 3.

(E) Compound 2 absorbs light of longer wavelength than compound 1.

(F) All three isomers contain six p electrons.