Concerning the relative stabilities of alkenes,which is a false statement?
A)Unless hydrogenation of the alkenes gives the same alkane,heats of hydrogenation cannot be used to measure their relative stabilities.
B)In general,the greater the number of alkyl groups attached to the carbon atoms of the double bond,the greater the stability of the alkene.
C)The greater the quantity of heat liberated on combustion or hydrogenation of an alkene,the greater its energy content.
D)trans-Cycloalkenes are always more stable than the cis-isomers.
E)Heats of combustion can be used to measure the relative stabilities of isomeric alkenes,even though their hydrogenation products are not identical.

Question

Quizplus · Accepted Answer

The statement "trans-cycloalkenes are always more stable than the cis-isomers" is false. While trans-cycloalkenes tend to be more stable than cis-isomers, there are cases where cis-isomers can be more stable, such as in small rings where the angle strain in a trans-isomer might outweigh the stability gained from having all substituents in the axial position. The other statements are true: A) heats of hydrogenation cannot be used to measure relative stabilities if the hydrogenation products are not identical, B) alkyl groups attached to the double bond increase stability, C) greater heat of combustion/hydrogenation indicates greater energy content, and E) heats of combustion can measure relative stabilities even if hydrogenation products are not identical.

Concerning the Relative Stabilities of Alkenes,which Is a False Statement