Functional Group Quiz

1. A molecule contains both –COOH and –COOCH₃ groups. Which group most directly supplies the acidic proton in a typical acid-base reaction?

2. What functional group is present in CH₃C(=O)Cl?

3. The linkage –C(=O)–NH– joins amino acid residues in a peptide. Which functional group is this?

4. A primary amine reacts with an aldehyde, and water is removed. The product contains a carbon-nitrogen double bond. Which functional group has formed?

5. How should the nitrogen-containing functional group in CH₃CH₂NHCH₃ be classified?

6. Which functional group is defined by the general structure R–SH?

7. A cyclohexane ring has an –OH group attached to one of its carbon atoms. What is the principal functional group?

8. Ethanoic acid reacts with ethanol and releases water. Which functional group is present in the organic product?

9. Oxidizing a primary alcohol under controlled conditions can produce a compound with a terminal –CHO group. What functional group has formed?

10. An organic molecule contains the unit R–C≡N. How should this functional group be classified?

11. A structure has the pattern R–C(=O)–O–C(=O)–R. Which functional group does it contain?

12. A compound rapidly undergoes addition across a carbon-carbon double bond. Which functional group is responsible for this reaction?

13. An –OH group is bonded directly to a carbon atom in a benzene ring. How is this functional group classified?

14. A molecule contains a three-membered ring made of two carbon atoms and one oxygen atom. What functional group is this?

15. An oxygen atom is singly bonded to two carbon groups, with no O–H bond present. Which functional group does this describe?

16. What is the principal functional group in CH₃COCH₂CH₃?