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प्रश्न
Write a preparation of phenol from cumene? What happens when phenol is heated with zinc dust?
उत्तर
a. Preparation of phenol from cumene:
1. When an alkaline solution of cumene ( isopropylbenzene or 2-phenylpropane) in sodium carbonate is oxidised by passing air or oxygen in the presence of cobalt naphthenate as a catalyst at 423 K, cumene hydroperoxide is obtained.
2. Auto oxidation:
Cumene hydroperoxide on heating with dilute H2SO4 decomposes forming phenol and acetone.
In this method, acetone is obtained as an important byproduct which is separated by distillation.
b. Heating of phenol with zinc dust:
When phenol is heated with zinc dust, benzene is formed.
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