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The C-H bond of the side chain in toluen...

The `C-H` bond of the side chain in toluene, `C_(6)H_(5)-CH_(3)`, has a dissociation energy of `77.5 kcal mol^(-1)`. Calculate `Delta_(f)H^(Theta)` of benzy`1` radical and the strength of the central bond in dibenzy`1 C_(6)H_(5)-CH_(2)-CH_(2)-C_(6)H_(5)` given that `Delta_(f)H^(Theta)` to toluene vapour in `12 kcal mol^(-1)` and that of dibenzy`1` vapour is `27.8 kcal mol^(-1). BE` of `H_(2) = 104 kcal mol^(-1)`.

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