What is the order of acidic strength for the | 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 stability of the phenoxide ion formed after the loss of a proton. Electron-withdrawing groups $(EWG)

Vedclass · Accepted Answer

$I < II < IV < III$

Vedclass · Answer

(A) The acidic strength of phenols depends on the stability of the phenoxide ion formed after the loss of a proton. Electron-withdrawing groups $(EWG)$ increase acidity by stabilizing the negative charge,while electron-donating groups $(EDG)$ decrease acidity by destabilizing it.$I$: $p$-cresol ($-CH_3$ is an $EDG$,which decreases acidity).$II$: Phenol (reference compound).$III$: $p$-nitrophenol ($-NO_2$ is a strong $EWG$ at the para position,providing both $-I$ and $-M$ effects,making it the most acidic).$IV$: $m$-nitrophenol ($-NO_2$ is an $EWG$ at the meta position,providing only $-I$ effect,making it less acidic than $p$-nitrophenol but more acidic than phenol).Comparing the effects:$p$-cresol $(I)$ Thus,the correct order is $I < II < IV < III$.

Acid	$pK_a$
$(i)$ Phenol	$a. 10$
$(ii)$ $p-$Nitrophenol	$b. 7.1$
$(iii)$ Ethyl alcohol	$c. 16$
$(iv)$ Picric acid	$d. 0.78$

What is the order of acidic strength for the following compounds?

Similar Questions

Match the following acids with their respective $pK_a$ values:
Acid $pK_a$
$(i)$ Phenol $a. 10$
$(ii)$ $p-$Nitrophenol $b. 7.1$
$(iii)$ Ethyl alcohol $c. 16$
$(iv)$ Picric acid $d. 0.78$

Explain the classification of phenols with examples.

What are $X$ and $Y$ respectively in the following set of reactions?

Which among the following has the highest melting point?

Which of the following compounds has the least $pK_a$ value?

Vedclass Test Series

Exam Paper Generator

Online Exam Module