Branched chain hydrocarbons, heat formation

Part A of Table 1.4 shows all the acyclic C4-C6 hydrocarbons and a number of the Cg hydrocarbons. A general trend is discernible in the heats of formation data. Branched-chain hydrocarbons are more stable than straight-chain hydrocarbons. For example, the MTf for n-octane is -49.82 kcal/mol, whereas the most highly branched isomer possible, 2,2,3,3-tetramethylbutane, is the most stable of the octanes, with a AH of -53.99 kcal/mol. Similar trends are observed in the other series. 

Hydrocaibons with branched chain Heat of formation of isomet ic hydrocarbon kcals Corresponding normal hydrocarbon Heat of formation of notmal hydrocarbon kcals Difference kcals... 

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