Final answer:
Isopropyl benzene undergoes air oxidation to yield phenol and acetone, thus the correct answer is d. C₆H₅OH.
Step-by-step explanation:
Isopropyl benzene, also known as cumene, when subjected to air oxidation in the presence of dilute acid, produces phenol (C₆H₅OH) and acetone (CH₃COCH₃). The process is a two-step radical chain reaction.
In the first step, cumene is converted to cumene hydroperoxide, and in the second step, cumene hydroperoxide undergoes acid-catalyzed cleavage to form phenol and acetone. Therefore, the correct answer is d. C₆H₅OH.