The intermediate carbocation formed in the reactions of HI, HBr and HCl with propene is the same and the bond energy of HCl, HBr and HI is 430.5 kJ mol–1, 363.7 kJ mol–1 and 296.8 kJ mol–1 respectively. What will be the order of reactivity of these halogen acids?
The intermediate carbocation formed in the reactions of HI, HBr and HCl with propene is the same and the bond energy of HCl, HBr and HI is 430.5 kJ mol–1, 363.7 kJ mol–1 and 296.8 kJ mol–1 respectively. What will be the order of reactivity of these halogen acids?
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1 Answer
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This is a short answer type question as classified in NCERT Exemplar
The rate-determining step involved in the reaction is
CH3-CH=CH2 + HX → CH3-CH+-CH3 + X-
So the rate-determining step depends on the bond energy of HX i.e. higher the bond energy lesser would be reactivity.
Thus the order of reactivity of these halogen acids is
HI>HBr>HCl
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