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Question

(C) The heat of combustion is directly proportional to the number of carbon atoms in the molecule. If the number of carbon atoms is the same,it is inv

Vedclass · Accepted Answer

$2 > 4 > 1 > 3$

Vedclass · Answer

(C) The heat of combustion is directly proportional to the number of carbon atoms in the molecule. If the number of carbon atoms is the same,it is inversely proportional to the stability of the molecule.$1$. Methylcyclopentane $(C_6H_{12})$: $6$ carbons.$2$. cis$-1,2-$Dimethylcyclobutane $(C_6H_{12})$: $6$ carbons.$3$. Cyclohexane $(C_6H_{12})$: $6$ carbons.$4$. trans$-1,2-$Dimethylcyclobutane $(C_6H_{12})$: $6$ carbons.Since all isomers have the same molecular formula $(C_6H_{12})$,the heat of combustion depends on their relative stability.Stability order: Cyclohexane $(3)$ > Methylcyclopentane $(1)$ > trans$-1,2-$Dimethylcyclobutane $(4)$ > cis$-1,2-$Dimethylcyclobutane $(2)$.Therefore,the order of decreasing heat of combustion is: $2 > 4 > 1 > 3$.

Rank the following substances in order of decreasing heat of combustion (maximum $\to$ minimum).

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