Which metal catalyzed reaction would release | vedclass

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(A) The heat of hydrogenation per $CH_2$ unit is directly proportional to the ring strain present in the cycloalkane. Cyclopropane has the highest rin

Vedclass · Accepted Answer

cyclopropane $+ H_2 	o$ propane

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(A) The heat of hydrogenation per $CH_2$ unit is directly proportional to the ring strain present in the cycloalkane. Cyclopropane has the highest ring strain due to significant angle strain ($60^{\circ}$ bond angles compared to the ideal $109.5^{\circ}$),making it highly unstable. Upon hydrogenation,the ring opens to form a stable alkane,releasing a large amount of energy. The order of heat of combustion ($H$.$O$.$C$.) per $CH_2$ unit is: cyclopropane $>$ cyclobutane $>$ cyclopentane $>$ cyclohexane. Therefore,the reaction involving cyclopropane releases the maximum amount of heat per $CH_2$ unit.

Which metal catalyzed reaction would release the maximum amount of heat per $CH_2$ unit?

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