Question:
Identify the reagent used for preparation of p-Benzoquinone from phenol.
Identify the reagent used for preparation of p-Benzoquinone from phenol.
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Oxidation of phenol with an acidified dichromate gives p-benzoquinone.
Updated On: Nov 12, 2026
- Concentrated \(\text{H}_{2}\text{SO}_{4}\)
- Dilute \(\text{H}_{2}\text{SO}_{4}\)
- \(\text{Na}_{2}\text{Cr}_{2}\text{O}_{7}/\text{H}_{2}\text{SO}_{4}\)
- \(\text{Cu}/573\ \text{K}\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Phenol can be oxidised to a conjugated diketone, p-benzoquinone.
Step 2: Reagent
The oxidising agent is sodium dichromate in sulfuric acid, \(\text{Na}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4\).
Step 3: Eliminate
Concentrated and dilute sulfuric acid are not oxidising enough for this change, and \(\text{Cu}/573\ \text{K}\) is used for dehydrogenation of alcohols.
Final Answer:
Acidified sodium dichromate converts phenol to p-benzoquinone. \[ \boxed{\text{(C) }\text{Na}_{2}\text{Cr}_{2}\text{O}_{7}/\text{H}_{2}\text{SO}_{4}} \]
Phenol can be oxidised to a conjugated diketone, p-benzoquinone.
Step 2: Reagent
The oxidising agent is sodium dichromate in sulfuric acid, \(\text{Na}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4\).
Step 3: Eliminate
Concentrated and dilute sulfuric acid are not oxidising enough for this change, and \(\text{Cu}/573\ \text{K}\) is used for dehydrogenation of alcohols.
Final Answer:
Acidified sodium dichromate converts phenol to p-benzoquinone. \[ \boxed{\text{(C) }\text{Na}_{2}\text{Cr}_{2}\text{O}_{7}/\text{H}_{2}\text{SO}_{4}} \]
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