8. Which of the following compounds has the highest heat of combustion per CH2 group? (A) cyclopropane (B) cyclobutane (C) cyclopentane (D) cyclohexane (E) all have equal ΔHcombustion

13. A mixture of oct-1-yne, oct-2-yne, and oct-3-yne was hydrogenated in the presence of a platinum catalyst until hydrogen uptake ceased. If one assumes that the hydrogenation went to completion, how many different eight-carbon hydrocarbons were produced? (A) 1 (B) 2 (C) 3 (D) 6 (E) 8