Chemistry – Multiple Choice Questions (MCQs)

1. 37. What is an enzyme?

   • A. A biological catalyst
   • B. An inorganic catalyst
   • C. A substance that inhibits biological reactions
   • D. A type of protein that stores energy

2. 38. What is organic chemistry?

   • A. The study of compounds containing carbon
   • B. The study of metals
   • C. The study of reactions in living organisms
   • D. The study of radioactive elements

3. 39. What is inorganic chemistry?

   • A. The study of carbon-containing compounds
   • B. The study of compounds that do not typically contain carbon
   • C. The study of polymers
   • D. The study of reaction rates

4. 40. What are alkanes?

   • A. Saturated hydrocarbons with single bonds
   • B. Unsaturated hydrocarbons with double bonds
   • C. Cyclic hydrocarbons
   • D. Aromatic hydrocarbons

5. 41. What are alkenes?

   • A. Saturated hydrocarbons
   • B. Hydrocarbons with at least one carbon-carbon double bond
   • C. Hydrocarbons with triple bonds
   • D. Hydrocarbons containing oxygen

6. 42. What are alkynes?

   • A. Hydrocarbons with single bonds
   • B. Hydrocarbons with double bonds
   • C. Hydrocarbons with at least one carbon-carbon triple bond
   • D. Cyclic hydrocarbons

7. 43. What are aromatic compounds?

   • A. Cyclic compounds with alternating single and double bonds
   • B. Aliphatic hydrocarbons
   • C. Compounds with only single bonds
   • D. Compounds containing metals

8. 44. What are functional groups?

   • A. Specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules
   • B. Long chains of carbon atoms
   • C. Inert gases attached to molecules
   • D. Metal atoms in a compound

9. 45. What is an alcohol functional group?

   • A. -COOH
   • B. -NH2
   • C. -OH
   • D. -CHO

10. 46. What is a carboxylic acid functional group?

    • A. -OH
    • B. -CHO
    • C. -COOH
    • D. -NH2

11. 47. What is an amine functional group?

    • A. -COOH
    • B. -OH
    • C. -CHO
    • D. -NH2

12. 48. What is an aldehyde functional group?

    • A. -OH
    • B. -COOH
    • C. -NH2
    • D. -CHO