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(A) The rate of electrophilic addition reaction is directly proportional to the stability of the carbocation intermediate formed after the attack of t

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$S > Q > R > P$

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(A) The rate of electrophilic addition reaction is directly proportional to the stability of the carbocation intermediate formed after the attack of the electrophile on the double bond.Electron-donating groups $(EDG)$ increase the stability of the carbocation,while electron-withdrawing groups $(EWG)$ decrease it.$(S)$ $-N(Me)_2$ is a strong $+M$ group,making the carbocation most stable.$(Q)$ $-OCH_3$ is a $+M$ group,but weaker than $-N(Me)_2$.$(R)$ $-CH_3$ is a $+I$ and hyperconjugative group,providing moderate stability.$(P)$ $-CHO$ is a strong $-M$ and $-I$ group,making the carbocation least stable.Therefore,the decreasing order of the rate of electrophilic addition is $S > Q > R > P$.

Arrange the following compounds in decreasing order of the rate of electrophilic addition reaction:
$(P)$ $p$-vinylbenzaldehyde
$(Q)$ $p$-vinylanisole
$(R)$ $p$-methylstyrene
$(S)$ $p$-dimethylaminostyrene

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Arrange the following compounds in decreasing order of the rate of electrophilic addition reaction:$(P)$ $p$-vinylbenzaldehyde$(Q)$ $p$-vinylanisole$(R)$ $p$-methylstyrene$(S)$ $p$-dimethylaminostyrene