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(B) The reactivity of alkenes towards electrophilic addition of $HBr$ depends on the stability of the intermediate carbocation formed after the proton

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$b > a > c$

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(B) The reactivity of alkenes towards electrophilic addition of $HBr$ depends on the stability of the intermediate carbocation formed after the protonation of the double bond.Greater the electron-donating ability of the substituent attached to the double bond,the more stable the resulting carbocation will be.In compound $(b)$,the $-OCH_3$ group is directly attached to the double bond and exerts a strong $+M$ (mesomeric) effect,which significantly stabilizes the carbocation.In compound $(a)$,the $-CH_3$ group exerts a $+I$ (inductive) effect and hyperconjugation,which provides moderate stability.In compound $(c)$,the $-CH_3OCH_2-$ group exerts a weak $+I$ effect,but it is further away from the double bond compared to the groups in $(a)$ and $(b)$,making it the least effective at stabilizing the carbocation.Therefore,the order of stability of the carbocations,and thus the reactivity of the alkenes,is $b > a > c$.

Arrange the following compounds in the decreasing order of their reactivity towards electrophilic addition of $HBr$:
$(a)$ $CH_3-C(CH_3)=CH_2$
$(b)$ $CH_3O-C(CH_3)=CH_2$
$(c)$ $CH_3OCH_2-C(CH_3)=CH_2$

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Arrange the following compounds in the decreasing order of their reactivity towards electrophilic addition of $HBr$:$(a)$ $CH_3-C(CH_3)=CH_2$$(b)$ $CH_3O-C(CH_3)=CH_2$$(c)$ $CH_3OCH_2-C(CH_3)=CH_2$