Which of the following gives two isomers of 3° alcohol, when treated with phenyl magnesium bromide ?

The correct answer for the question "Which of the following gives two isomers of 3° alcohol, when treated with phenyl magnesium bromide?" is:

Option b.

Explanation:

• Phenyl magnesium bromide (C₆H₅MgBr) reacts with ketones to form tertiary alcohols.
• Option b shows a structure where two different substituents are present on the carbonyl group, making it possible for two isomers to form when phenyl magnesium bromide reacts with the ketone.
• The different locations for the phenyl group to add lead to the formation of two possible tertiary alcohol isomers.