The order of acidic strength of the following | vedclass

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

Question

(A) The acidic strength depends on the stability of the conjugate base formed after the loss of a proton.$(i)$ is $4$-ethylcyclohexanecarboxylic acid

Vedclass · Accepted Answer

$(iii) > (ii) > (i)$

Vedclass · Answer

(A) The acidic strength depends on the stability of the conjugate base formed after the loss of a proton.$(i)$ is $4$-ethylcyclohexanecarboxylic acid (aliphatic).$(ii)$ is $4$-methoxybenzoic acid (aromatic with $+R$ effect of $-OCH_3$ group).$(iii)$ is $4$-nitrobenzoic acid (aromatic with $-R$ effect of $-NO_2$ group).$1$. Aromatic carboxylic acids are generally stronger than aliphatic carboxylic acids due to the resonance stabilization of the carboxylate anion by the benzene ring.$2$. The $-NO_2$ group in $(iii)$ exerts a strong $-R$ (electron-withdrawing) effect,which stabilizes the carboxylate anion and significantly increases acidity.$3$. The $-OCH_3$ group in $(ii)$ exerts a $+R$ (electron-donating) effect,which destabilizes the carboxylate anion and decreases acidity compared to benzoic acid,but it is still more acidic than the aliphatic acid $(i)$ due to the aromatic ring.Therefore,the order of acidic strength is $(iii) > (ii) > (i)$.

The order of acidic strength of the following acids is:

Similar Questions

Formaldehyde and formic acid can be distinguished using

Number of $CO_2$ molecules evolved upon heating the given compound.

Which of the following represents the correct order of the acidity in the given compounds?

What is the decreasing order of acidic strength for the following acids?
$[I]$ Methanoic acid
$[II]$ Ethanoic acid
$[III]$ Propanoic acid
$[IV]$ Butanoic acid

Which acid can be oxidised by Fehling solution?

Vedclass Test Series

Exam Paper Generator

Online Exam Module