Question:
The correct sequence of reagents X and Z in the conversion of diazonium salt to p-benzoquinone is:
The correct sequence of reagents X and Z in the conversion of diazonium salt to p-benzoquinone is:
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Diazonium salts → phenol (hydrolysis) → quinone (strong oxidation).
Updated On: Jun 12, 2026
- V & II
- III & IV
- III & I
- V & IV
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The Correct Option is D
Solution and Explanation
Concept:
Aryl diazonium salts undergo hydrolysis to phenol, which can be strongly oxidized to p-benzoquinone.
Step 1: Hydrolysis of diazonium salt (X).
At 283 K, water replaces the diazonium group to form phenol: \[ \text{C}_6\text{H}_5\text{N}_2^+ \xrightarrow{\text{H}_2\text{O},\,283K} \text{C}_6\text{H}_5\text{OH} \]
Step 2: Oxidation to p-benzoquinone (Z).
Phenol is oxidized using acidified dichromate to form p-benzoquinone: \[ \text{C}_6\text{H}_5\text{OH} \xrightarrow{\text{Na}_2\text{Cr}_2\text{O}_7/H^+} \text{p-benzoquinone} \] Conclusion:
Thus, X = H$_2$O (283 K) and Z = Na$_2$Cr$_2$O$_7$/H$^+$.
Step 1: Hydrolysis of diazonium salt (X).
At 283 K, water replaces the diazonium group to form phenol: \[ \text{C}_6\text{H}_5\text{N}_2^+ \xrightarrow{\text{H}_2\text{O},\,283K} \text{C}_6\text{H}_5\text{OH} \]
Step 2: Oxidation to p-benzoquinone (Z).
Phenol is oxidized using acidified dichromate to form p-benzoquinone: \[ \text{C}_6\text{H}_5\text{OH} \xrightarrow{\text{Na}_2\text{Cr}_2\text{O}_7/H^+} \text{p-benzoquinone} \] Conclusion:
Thus, X = H$_2$O (283 K) and Z = Na$_2$Cr$_2$O$_7$/H$^+$.
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