Question

The product of the following reaction is P.

The number of hydroxyl groups present in the product P is ______.

Answer 1

Correct Answer: 0

The number of hydroxyl groups in product \( P \) is determined by a step-by-step analysis of the reaction.

1. The reactant is a benzaldehyde with a para-positioned hydroxyl group.
2. PhMgBr is a Grignard reagent that adds to carbonyl groups, forming alcohols.
3. PhMgBr reacts with the aldehyde's carbonyl group, creating a benzyl alcohol by converting the C=O to a C-OH.
4. Aqueous NH₄Cl is used post-addition for protonation, stabilizing the alcohol.
5. The initial compound possesses one hydroxyl group, and the reaction introduces a second one.

Consequently, product \( P \) has two hydroxyl groups, aligning with the specified range of 0,0.