Class 12Chemistry8-2.Carboxylic acids and Their derivativePreparation of Carboxylic Acids and Their Derivatives
MediumWrite a note on the preparation of carboxylic acid from alkyl benzene.
(N/A) Aromatic carboxylic acids can be prepared by the vigorous oxidation of alkyl benzenes with chromic acid or acidic/alkaline potassium permanganate $(KMnO_4)$.
$(a)$ The entire side chain is oxidized to the carboxyl group $(-COOH)$ irrespective of the length of the side chain,provided that the benzylic carbon atom has at least one hydrogen atom.
$(b)$ Primary and secondary alkyl groups are oxidized to the carboxyl group in this manner.
$(c)$ If the benzylic carbon atom does not have any hydrogen atom (i.e.,tertiary alkyl group),then oxidation is not possible.
$(d)$ The reaction proceeds via the formation of a potassium salt (e.g.,potassium benzoate),which upon acidic hydrolysis $(H_3O^+)$ yields the corresponding aromatic carboxylic acid.
General reaction:
$C_6H_5-CH_2-R$ $\xrightarrow[\Delta]{KMnO_4, KOH} C_6H_5-COOK$ $\xrightarrow{H_3O^+} C_6H_5-COOH$
$(a)$ The entire side chain is oxidized to the carboxyl group $(-COOH)$ irrespective of the length of the side chain,provided that the benzylic carbon atom has at least one hydrogen atom.
$(b)$ Primary and secondary alkyl groups are oxidized to the carboxyl group in this manner.
$(c)$ If the benzylic carbon atom does not have any hydrogen atom (i.e.,tertiary alkyl group),then oxidation is not possible.
$(d)$ The reaction proceeds via the formation of a potassium salt (e.g.,potassium benzoate),which upon acidic hydrolysis $(H_3O^+)$ yields the corresponding aromatic carboxylic acid.
General reaction:
$C_6H_5-CH_2-R$ $\xrightarrow[\Delta]{KMnO_4, KOH} C_6H_5-COOK$ $\xrightarrow{H_3O^+} C_6H_5-COOH$
Explore More
Similar Questions
$CH_3MgBr + CO_2$ $\xrightarrow{\text{Dry ether}} Y$ $\xrightarrow{H_3O^{\oplus}} Z$
Identify $Z$ from the following.
Identify $Z$ from the following.
Consider the following reactions. From these reactions,which reaction will give carboxylic acid as a major product?
$(A)$ $R-C \equiv N \xrightarrow[(i) H^{+}/H_2O]{\text{mild condition}} R-CONH_2$
$(B)$ $R-MgX \xrightarrow[(ii) H_3O^{+}]{\text{(i) } CO_2} R-COOH$
$(C)$ $R-C \equiv N \xrightarrow[(ii) H_3O^{+}]{\text{(i) } SnCl_2/HCl} R-CHO$
$(D)$ $R-CH_2-OH \xrightarrow{PCC} R-CHO$
$(E)$ $\text{Benzoyl chloride} \xrightarrow[(ii) Br_2/H_2O]{\text{(i) } H_2/Pd-BaSO_4} \text{Benzoic acid}$
Choose the correct answer from the options given below:
$(A)$ $R-C \equiv N \xrightarrow[(i) H^{+}/H_2O]{\text{mild condition}} R-CONH_2$
$(B)$ $R-MgX \xrightarrow[(ii) H_3O^{+}]{\text{(i) } CO_2} R-COOH$
$(C)$ $R-C \equiv N \xrightarrow[(ii) H_3O^{+}]{\text{(i) } SnCl_2/HCl} R-CHO$
$(D)$ $R-CH_2-OH \xrightarrow{PCC} R-CHO$
$(E)$ $\text{Benzoyl chloride} \xrightarrow[(ii) Br_2/H_2O]{\text{(i) } H_2/Pd-BaSO_4} \text{Benzoic acid}$
Choose the correct answer from the options given below:
Which among the following compounds is $NOT$ used for the preparation of aromatic carboxylic acids from alkyl benzene?
The acid formed when propyl magnesium bromide is treated with carbon dioxide is:
Medium
View SolutionThe compound $X$ in the reaction is: $X$ $\xrightarrow{CH_3MgI} Y$ $\xrightarrow{\text{hydrolysis}} Mg(OH)I + CH_3COOH$
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo