Which of the following is most acidic?

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

Question

(D) The acidity of phenols is increased by electron-withdrawing groups $(EWG)$ attached to the benzene ring,as they stabilize the phenoxide ion throug

Vedclass · Accepted Answer

$p$-Hydroxybenzoic acid

Vedclass · Answer

(D) The acidity of phenols is increased by electron-withdrawing groups $(EWG)$ attached to the benzene ring,as they stabilize the phenoxide ion through inductive and resonance effects.Comparing the substituents at the para position:$1$. Phenol: No substituent.$2$. $p$-Nitrophenol: The $-NO_2$ group is a strong electron-withdrawing group ($-I$ and $-M$ effects).$3$. $p$-Cyanophenol: The $-CN$ group is an electron-withdrawing group ($-I$ and $-M$ effects),but less strong than $-NO_2$.$4$. $p$-Hydroxybenzoic acid: The $-COOH$ group is an electron-withdrawing group ($-I$ and $-M$ effects). However,in $p$-hydroxybenzoic acid,the acidity is primarily determined by the carboxylic acid group $(-COOH)$ rather than the phenolic $-OH$ group. Carboxylic acids are significantly more acidic than phenols. Therefore,$p$-hydroxybenzoic acid is the most acidic among the given options.

Similar Questions

$CH_3COOH \xrightarrow{\Delta, P_2O_5} X$. Identify $X$.

Which reagent will bring about the conversion of carboxylic acids into esters?

Acetic acid reacts with $PCl_5$ to form

Oxalic acid when reduced with zinc and $H_2SO_4$ gives

In a set of reactions,ethylbenzene yielded a product $D$.
Ethylbenzene $\xrightarrow[KOH]{KMnO_4} B$ $\xrightarrow[FeCl_3]{Br_2} C$ $\xrightarrow[H^{+}]{C_2H_5OH} D$
$D$ would be

Vedclass Test Series

Exam Paper Generator

Online Exam Module