Which of the following groups is capable of hydrogen bonding with an oxygen atom on another functional group?

• A. Amino group
• B. Hydroxyl group
• C. Carboxyl group
• D. All of the listed responses are correct.

Answer: (D)

Verified step by step guidance

1. Understand that hydrogen bonding occurs when a hydrogen atom, which is covalently bonded to a more electronegative atom, interacts with another electronegative atom, such as oxygen.
2. Recognize that an amino group (NH2) contains a nitrogen atom bonded to hydrogen atoms. The nitrogen is electronegative, allowing the hydrogen atoms to participate in hydrogen bonding with an oxygen atom from another group.
3. Identify that a hydroxyl group (OH) consists of an oxygen atom bonded to a hydrogen atom. The electronegative oxygen can form hydrogen bonds with hydrogen atoms from other groups, and the hydrogen can bond with oxygen atoms from other groups.
4. Note that a carboxyl group (COOH) contains both a carbonyl (C=O) and a hydroxyl (OH) component. The oxygen in the carbonyl can accept hydrogen bonds, and the hydrogen in the hydroxyl can donate hydrogen bonds.
5. Conclude that all the listed groups (amino, hydroxyl, and carboxyl) have the ability to form hydrogen bonds with an oxygen atom on another functional group, due to the presence of electronegative atoms and hydrogen atoms capable of participating in hydrogen bonding.