Question:
Identify the substrate ' X ' in the following reaction.
$\text{X} + \underset{(\text{air})}{\text{O}_2} \xrightarrow[\text{ii) dil HCl } \Delta]{\text{i) Co-naphenate } 423 \text{ K}} \text{Phenol} + \text{Acetone}$
Identify the substrate ' X ' in the following reaction.
$\text{X} + \underset{(\text{air})}{\text{O}_2} \xrightarrow[\text{ii) dil HCl } \Delta]{\text{i) Co-naphenate } 423 \text{ K}} \text{Phenol} + \text{Acetone}$
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Whenever you see "Phenol + Acetone" as products, the starting material is always Cumene (Isopropyl benzene).
Updated On: May 14, 2026
- Chlorobenzene
- Benzene sulphonic acid
- Benzenamine
- Isopropyl benzene
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The Correct Option is D
Solution and Explanation
Step 1: Concept
This is the industrial method for the preparation of phenol, known as the Cumene process.
Step 2: Meaning
Cumene is the common name for isopropyl benzene.
Step 3: Analysis
Isopropyl benzene (X) reacts with air (oxidation) to form cumene hydroperoxide. This intermediate, when treated with dilute acid, decomposes to produce phenol and a valuable byproduct, acetone.
Step 4: Conclusion
The starting material X is Isopropyl benzene. Final Answer: (D)
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