Which functional group compound is obtained by the reaction of an oxoacid with a hydroxyl compound, such as alcohol or phenol?

Esters

The correct answer is option 2. Esters.

The functional group compound obtained by the reaction of an oxoacid with a hydroxyl compound is 2. Esters.

Here's why:

Oxoacids: These are acids containing oxygen atoms within their acidic functional group. Examples include carboxylic acids (RCOOH) and phosphoric acid (H₃PO₄).

Hydroxyl compounds: These are molecules containing a hydroxyl group (OH) bonded to a carbon atom. Examples include alcohols (R-OH) and phenols (Ar-OH).

Esterification: The reaction between an oxoacid and a hydroxyl compound is called esterification. In this reaction, the hydroxyl group of the alcohol or phenol reacts with the acidic hydrogen of the oxoacid, forming an ester and water.

Therefore, the product of the reaction between an oxoacid and a hydroxyl compound is an ester.