The decreasing order of the rate of reaction | vedclass

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(A) The rate of electrophilic addition reaction depends on the stability of the intermediate carbocation formed. Electron-donating groups $(EDG)$ incr

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$d > b > c > a$

Vedclass · Answer

(A) The rate of electrophilic addition reaction depends on the stability of the intermediate carbocation formed. Electron-donating groups $(EDG)$ increase the stability of the carbocation,thereby increasing the rate of reaction,while electron-withdrawing groups $(EWG)$ decrease it. The substituents attached to the benzene ring are: $(a) -NO_2$ (strong $EWG$,$-R$ and $-I$ effect) $(b) -OH$ (strong $EDG$,$+R$ effect) $(c) -CH_3$ (weak $EDG$,$+I$ and hyperconjugation) $(d) -NH_2$ (strongest $EDG$,$+R$ effect) The order of electron-donating ability is $-NH_2 > -OH > -CH_3 > -NO_2$. Therefore,the stability of the carbocation intermediate follows the order $d > b > c > a$. Thus,the decreasing order of the rate of reaction is $d > b > c > a$.

The decreasing order of the rate of reaction of the following molecules towards electrophilic addition reaction is:

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