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

To determine the number of hydroxyl groups in the product \( P \) of the given reaction, we must analyze the reaction step-by-step. 

1. The reactant is a benzaldehyde with an additional hydroxyl (-OH) group at the para position.
2. The reagent PhMgBr is a Grignard reagent. Grignard reagents add to carbonyl groups (C=O) to form alcohols.
3. In the first step, PhMgBr will react with the aldehyde group (CHO) to form a benzyl alcohol. This converts the C=O group of the aldehyde into a C-OH group.
4. After the Grignard addition, aqueous NH₄Cl is used to protonate the oxygen, stabilizing the alcohol product.
5. The starting compound already has one hydroxyl group, and the reaction adds one more hydroxyl group.

Therefore, the total number of hydroxyl groups in the product \( P \) is 2, which falls within the given range of 0,0.

Answer 2

Product benzene has zero hydroxyl group. The reaction leads to formation of a substituted product without hydroxyl groups present.