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Question

(A) The reactivity of alkenes towards electrophilic addition reaction with $HBr$ depends on the stability of the carbocation intermediate formed durin

Vedclass · Accepted Answer

$CH_2 = CH_2 < R - CH = CH - R < R_2C = CH - R < R_2C = CR_2$

Vedclass · Answer

(A) The reactivity of alkenes towards electrophilic addition reaction with $HBr$ depends on the stability of the carbocation intermediate formed during the reaction. Greater the number of electron-donating alkyl groups attached to the double-bonded carbons,the more stable the resulting carbocation will be due to the inductive effect and hyperconjugation. The order of stability of carbocations is: $3^\circ > 2^\circ > 1^\circ > ext{methyl}$. Therefore,the reactivity order is: $CH_2 = CH_2 < R - CH = CH - R < R_2C = CH - R < R_2C = CR_2$.

Arrange the following compounds in the order of their reactivity towards electrophilic addition reaction with $HBr$.

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