1.

Which cycloalkane has the lowest heat of combustion per CH_2 group

Answer»

CYCLOPROPANE
Cyclobutane
Cyclopentane
Cyclohexane

Solution :In cyclopropane, the angle strain is maximum hence it is a highly strained MOLECULE and CONSEQUENTLY most unstable . The angle strain in cyclobutane is less than than in cyclopropane, hence cyclobutane is more stable than cyclopropane, hence cyclobutane is more stable than cyclopropane. This stability increases upto 6 membered rings, then decreases from 7 to 11 membered rings and from the 12 membered onwards attains the stability of 6 membered ring. Heat of combustion is a METHOD of measuring chemical stability . Hence cyclohenxane has the lowest heat of combustion per `-CH_2` group.


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