Question:
Identify product ' B ' in the following reaction.
\[ \text { Cumene } \xrightarrow[\Delta]{\mathrm{KMnO}_4, \mathrm{KOH}} \mathrm{~A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B} \]
Identify product ' B ' in the following reaction.
\[ \text { Cumene } \xrightarrow[\Delta]{\mathrm{KMnO}_4, \mathrm{KOH}} \mathrm{~A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B} \]
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Vigorous oxidation of an alkyl benzene converts the whole side chain with a benzylic hydrogen into a carboxyl group.
Updated On: Nov 13, 2026
Phenol
Benzaldehyde
Benzophenone
Benzoic acid
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Alkaline \(\text{KMnO}_4\) on heating oxidises any alkyl side chain having a benzylic hydrogen to a carboxylate group, whatever the length of the chain.
Step 2: Apply to cumene
Cumene has an isopropyl group with one benzylic hydrogen.
Oxidation gives potassium benzoate \(\text{C}_6\text{H}_5\text{COOK}\) as A.
Step 3: Acidification
Treating A with \(\text{H}_3\text{O}^{+}\) liberates \(\text{C}_6\text{H}_5\text{COOH}\), so B is benzoic acid.
Final Answer:
Product B is benzoic acid. \[ \boxed{\text{(D) }\text{Benzoic acid}} \]
Alkaline \(\text{KMnO}_4\) on heating oxidises any alkyl side chain having a benzylic hydrogen to a carboxylate group, whatever the length of the chain.
Step 2: Apply to cumene
Cumene has an isopropyl group with one benzylic hydrogen.
Oxidation gives potassium benzoate \(\text{C}_6\text{H}_5\text{COOK}\) as A.
Step 3: Acidification
Treating A with \(\text{H}_3\text{O}^{+}\) liberates \(\text{C}_6\text{H}_5\text{COOH}\), so B is benzoic acid.
Final Answer:
Product B is benzoic acid. \[ \boxed{\text{(D) }\text{Benzoic acid}} \]
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