Answer:
The correct option is: B. alcohol
Explanation:
<u>A. ester (R-COOR'):</u> In this functional group, the carbon atom forms a single bond with an alkoxy group and a double-bond with an oxygen atom.
<u>B. alcohol (R-COH):</u> In this functional group, the carbon atom is bonded to a hydroxyl group.
<u>C. thiol (R-SH):</u> In this functional group, the carbon atom is bonded to a thiol group.
<u>D. carbonyl (R-COR')</u>: In this functional group, the carbon atom forms a double-bond with an oxygen atom.
<u>Therefore, alcohols are the class of organic molecules in which a carbon atom is bonded to a hydroxyl functional group.</u>