The increasing order of acidic strength of th | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

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

Vedclass · Accepted Answer

$III < I < IV < II$

Vedclass · Answer

(A) The acidic strength of phenols depends on the nature of the substituent attached to the benzene ring.Electron-withdrawing groups $(EWG)$ increase acidic strength by stabilizing the phenoxide ion,while electron-donating groups $(EDG)$ decrease it.$(I)$ $p$-cresol: $-CH_3$ group shows $+I$ and $+H$ effects $(EDG)$.$(II)$ $p$-cyanophenol: $-CN$ group shows strong $-I$ and $-M$ effects $(EWG)$.$(III)$ $p$-methoxyphenol: $-OCH_3$ group shows $+M$ effect (strong $EDG$) and $-I$ effect.$(IV)$ Phenol: No substituent.Comparing the effects: The $-OCH_3$ group in $(III)$ is a stronger electron donor than the $-CH_3$ group in $(I)$ due to the $+M$ effect. Thus,$(III)$ is the least acidic.The order of acidity is: $(III) Therefore,the correct option is $A$.

The increasing order of acidic strength of the given compounds is:

Similar Questions

Write the chemical reactions for the preparation of anisole and phenetole from phenol.

Which one is the most acidic compound?

The major product formed in the following reaction is:

What is the structure of the major product when phenol is treated with bromine water?

Which compound does not react with $NaHCO_3$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module