For each of the following, choose the best answer; give the letter.
(a) Which has the lower heat of combustion: (i) (E)-3-hexene or (ii) 1-hexene?
(b) Which one has the higher heat of combustion: (i) (E)-cyclooctene or (ii) (Z)-cyclooctene?
(c) Which one has the lower boiling point: (i) chloroform or (ii) methylene chloride?
(d) Which one has the higher boiling point: (i) 1,1,1-trifluoroethane or (ii) hexafluoroethane?
(e) Which one is more dense: (i) 1-iodooctane or (ii) 1-bromooctane?
(f) Which one is more dense: (i) water or (ii) 1-iodooctane?
(g) Which one is thermodynamically more stable: (i) 3-methylcyclohexyl cation or (ii) 1-methylcyclohexyl cation?
(h) Which one can be the units of a first-order rate constant: (i) L mol−1 s−1 or (ii) s−1 ?
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