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Use the bond enthalpies given to estimate the heat released when 1-bromobutene, CH3CH2CH=CH2,
Reacts with bromine to give CH3CH2CHBrCH2Br.
Bond enthalpies (kJ.mol-1) : C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.
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