3. Upon hydrogenation, which of the following alkenes releases the least heat per mole? (3%)
(A) 3,4-dimethyl-1-hexene
(B) (Z)-3,4-dimethyl-2-hexene
(C) ( E )-3,4-dimethyl-2-hexene
(D) (Z)-3,4-dimethyl-3-hexene
(E) ( E )-3,4-dimethyl-3-hexene

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