Which important compound is prepared by using cumene?

Phenol

The correct answer is Option (2) → Phenol

Cumene process is used industrially to prepare phenol.

$\text{Cumene} \rightarrow \text{Cumene hydroperoxide} \rightarrow \text{Phenol} + \text{Acetone}$

Option 1: Ethanol

Prepared by fermentation or hydration of ethene. Not from cumene.

Option 2: Phenol

Cumene oxidation followed by acid treatment gives phenol. This is the main industrial method.

Option 3: Propanone

Acetone is also produced in cumene process but it is a by-product. Main important compound is phenol.

Option 4: Propene

Used to make cumene, not obtained from it.