Which of the following is a functional group commonly found in alcohols?

• A. Hydroxyl group ($-OH$)
• B. Amino group ($-NH2$)
• C. Carbonyl group ($C=O$)
• D. Carboxyl group ($-COOH$)

Answer: (A)

Verified step by step guidance

1. Identify the functional groups listed in the options: Hydroxyl group (-OH), Amino group (-NH2), Carbonyl group (C=O), and Carboxyl group (-COOH).
2. Recall the definition of an alcohol in organic chemistry: Alcohols are organic compounds that contain one or more hydroxyl groups (-OH) attached to a carbon atom.
3. Understand that the hydroxyl group (-OH) is the characteristic functional group of alcohols, responsible for their chemical properties.
4. Compare the functional groups provided in the options with the definition of alcohols to determine which one matches.
5. Conclude that the hydroxyl group (-OH) is the functional group commonly found in alcohols, as it is directly mentioned in the definition of alcohols.