Rank the following compounds in order of incr | vedclass

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Question

(A) The acidic strength of phenols depends on the nature of substituents attached to the benzene ring. Electron-withdrawing groups $(EWG)$ increase ac

Vedclass · Accepted Answer

$2 < 4 < 1 < 3$

Vedclass · Answer

(A) The acidic strength of phenols depends on the nature of substituents attached to the benzene ring. Electron-withdrawing groups $(EWG)$ increase acidity by stabilizing the phenoxide ion,while electron-donating groups $(EDG)$ decrease acidity by destabilizing it.$(1)$ $2,4,6$-trichlorophenol: Contains three $-Cl$ groups,which are electron-withdrawing by the inductive effect $(-I)$.$(2)$ $2,4,6$-trimethylphenol: Contains three $-CH_3$ groups,which are electron-donating by the inductive effect $(+I)$ and hyperconjugation.$(3)$ $2,4,6$-trinitrophenol (picric acid): Contains three $-NO_2$ groups,which are strong electron-withdrawing groups by both $-I$ and $-M$ (mesomeric) effects.$(4)$ Phenol: Has no substituent.Comparing the effects:- $-CH_3$ $(EDG)$ makes the compound less acidic than phenol.- $-Cl$ $(EWG)$ makes the compound more acidic than phenol.- $-NO_2$ (strong $EWG$) makes the compound significantly more acidic than phenol.Order of increasing acidity: $(2) Thus,the correct option is $A$.

Rank the following compounds in order of increasing acidic strength.

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