Which of the following is the correct order o | vedclass

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(A) $1$. For electrophilic addition to alkenes,the reactivity depends on the stability of the carbocation intermediate formed. Electron-donating group

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(Electrophilic addition reaction)

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(A) $1$. For electrophilic addition to alkenes,the reactivity depends on the stability of the carbocation intermediate formed. Electron-donating groups $(EDG)$ increase the electron density on the double bond,making it more reactive towards electrophiles. The order of $EDG$ strength is $-C_2H_5 > -CH_3 > -H > -OH$ (due to the strong $-I$ effect of $-OH$ outweighing its $+M$ effect in this specific context of electrophilic addition to styrene derivatives). Thus,the order shown in option $A$ is correct.$2$. For Grignard's reagent addition to carbonyls,the reactivity depends on the electrophilicity of the carbonyl carbon. Steric hindrance and electronic effects matter. The order $PhCHO > CH_3CHO > HCHO$ is incorrect as $HCHO$ is the most reactive due to minimal steric hindrance and lack of electron-donating groups.$3$. For Wurtz reaction,the reactivity order is $R-I > R-Br > R-Cl > R-F$ because the $C-X$ bond strength decreases down the group.$4$. For halogenation of alkanes,the reactivity order is $F_2 > Cl_2 > Br_2 > I_2$.

Which of the following is the correct order of reactivity for:

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