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# Cycloalkanes and Molar Heats of Combustion

ORGO1-B72PHH

Cycloalkanes, like alkanes, undergo combustion in the presence of oxygen to form carbon dioxide and water. The energy released from this reaction is known as the molar heat of combustion and is often used to measure the relative stability of cycloalkanes when standardized by dividing the value by the number of ${ CH }_{ 2 }$ units in the molecule. The more stable the molecule is the lower its heat of combustion per ${ CH }_{ 2 }$.

Which one of the following molecules would have the highest molar heat of combustion per ${ CH }_{ 2 }$?

A

Cyclobutane.

B

Cyclopentane.

C

Cyclohexane.

D

Cycloheptane.