Which cycloalkane has the lowest heat of combustion per −CH2 group?
A
Cyclopropane
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B
Cyclobutane
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C
Cyclopentane
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D
Cyclohexane
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Solution
The correct option is D Cyclohexane From the data, cyclopropane and cyclobutane have significantly higher heats of combustion per CH2, while cyclohexane has the lowest heat of combustion.