Which of the following organic molecules contains both an $\text{amine}$ group and a $\text{carboxyl}$ group?

• A. Glycine
• B. Methanol
• C. Acetone
• D. Benzene

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the functional groups involved. An amine group is characterized by the presence of a nitrogen atom bonded to hydrogen(s) and/or carbon atoms, typically represented as \(\mathrm{-NH_2}\), \(\mathrm{-NHR}\), or \(\mathrm{-NR_2}\). A carboxyl group is a functional group containing a carbon double bonded to oxygen and also bonded to a hydroxyl group, represented as \(\mathrm{-COOH}\).
2. Step 2: Analyze each molecule to identify these groups. Methanol has the formula \(\mathrm{CH_3OH}\) and contains a hydroxyl group (\(\mathrm{-OH}\)) but no amine or carboxyl groups.
3. Step 3: Acetone has the formula \(\mathrm{CH_3COCH_3}\) and contains a carbonyl group (\(\mathrm{C=O}\)) as part of a ketone, but it lacks both amine and carboxyl groups.
4. Step 4: Benzene is a simple aromatic hydrocarbon with the formula \(\mathrm{C_6H_6}\) and contains only carbon and hydrogen atoms arranged in a ring; it does not have amine or carboxyl groups.
5. Step 5: Glycine is an amino acid with the formula \(\mathrm{NH_2CH_2COOH}\). It contains both an amine group (\(\mathrm{-NH_2}\)) and a carboxyl group (\(\mathrm{-COOH}\)), making it the molecule that fits the criteria.