Which one of the following has the smallest h | vedclass

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(A) The heat of combustion of an isomer is inversely proportional to its thermodynamic stability. $A$ more stable isomer has a lower potential energy

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(A) The heat of combustion of an isomer is inversely proportional to its thermodynamic stability. $A$ more stable isomer has a lower potential energy and thus releases less energy upon combustion. In substituted cyclohexanes,the most stable isomer is the one that allows the largest substituents (like the tert-butyl group) to occupy the equatorial position to minimize $1,3-$diaxial interactions. The isomer where all bulky groups are in equatorial positions is the most stable and therefore has the smallest heat of combustion.

Column-$I$	Column-$II$
$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)$$2$-butanol,$(-)$$2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

Which one of the following has the smallest heat of combustion?

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