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(A) The heat of combustion is directly proportional to the number of carbon atoms.When the number of carbon atoms is the same,the heat of combustion i

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$A > B > C$

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(A) The heat of combustion is directly proportional to the number of carbon atoms.When the number of carbon atoms is the same,the heat of combustion is inversely proportional to the degree of branching (more branching leads to greater stability,thus lower heat of combustion).All three structures ($A$,$B$,and $C$) are isomers of hexane $(C_6H_{14})$.Structure $A$ is $n$-hexane (no branching).Structure $B$ is $2,4$-dimethylbutane (two branches).Structure $C$ is $2,3$-dimethylbutane (two branches,but more compact/stable than $B$).Comparing stability: $A Therefore,the order of heat of combustion is $A > B > C$.

Rank the following substances in decreasing order of heat of combustion (most exothermic $\to$ least exothermic).

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