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Gaseous chlorine reacts with ethylene to give 1,2-dichloroethane by the thermochemical Eq. 1:
Cl2 (g) + C2H4 (g) ⟶ ClCH2CH2Cl (g) ∆Hº = –182 kJ mol–1 (1)
(a) Given the average bond dissociation enthalpies, estimate the BDE of a C—Cl bond.