Organic Chemistry Practice Questions Set 2

1. Which chemical formula is both an empirical formula and a molecular formula?
  1. CH4 
  2. C2H6 
  3. CH3COOH 
  4. CH3CH2COOCH3
2. Which element is present in all organic compounds?
  1. Hydrogen 
  2. Nitrogen 
  3. Carbon 
  4. Oxygen
3. What products are obtained with CH4(g) burns completely in an excess of oxygen?
  1. CO and H2O 
  2. CO and C 
  3. CO2 and H2O 
  4. CO2 and CO
4. Which hydrocarbon is a member of the alkene series?
  1. C2H2 
  2. C3H6 
  3. C4H10 
  4. C4H12
5. Which formula represents butane?
  1. CH3CH3 
  2. CH3CH2CH3 
  3. CH3CH2CH2CH3 
  4. CH3CH2CH2CH2CH3
6. A hydrocarbon molecule is considered to be saturated if the molecule contains
  1. Single covalent bonds, only 
  2. A double covalent bond, only 
  3. A triple covalent bond 
  4. Single and double covalent bonds
7. As a chemical bond forms between 2 hydrogen atoms in a system, energy is released and the stability of the system
  1. Increases 
  2. Decreases 
  3. Remains the same
8. In a chemical reaction, as the species is oxidized, its oxidation number
  1. Decreases 
  2. Increases 
  3. Remains the same
9. A hydrocarbon with no ring structure, no double or triple bonds is called an ______.
  1. Alkene 
  2. Alkyne 
  3. Alkane 
  4. Alkali
10. A hydrocarbon double bonds and no triple bond configuration is called an ______.
  1. Alkene 
  2. Alkyne 
  3. Alkane 
  4. Alkali
11. A hydrocarbon with triple bonds is called an _____
  1. Alkene 
  2. Alkyne 
  3. Alkane 
  4. Alkali
12. Which of the following is the molecular formula for ethylene?
  1. C2H2 
  2. C2H4 
  3. C2H6 
  4. C2H8
13. Which of the following is the molecular formula for ethane?
  1. C2H2 
  2. C2H4 
  3. C2H6 
  4. C2H8
14. Which of the following is the molecular formula for acetylene?
  1. C2H2 
  2. C2H4 
  3. C2H6 
  4. C2H8
15. Which of the following is the molecular formula for butane?
  1. C2H 
  2. C2H6 
  3. C4H8 
  4. C4H10
16. Which of the following is the molecular formula for hexane?
  1. C5H11 
  2. C5H12 
  3. C6H12 
  4. C6H14
17. Which of the following is the molecular formula for pentane?
  1. C5H11 
  2. C5H12 
  3. C6H12 
  4. C6H14

 

Answer Key

1. A 
2. C 
3. C 
4. B 
5. C 
6. A 
7. A 
8. B 
9. C 
10. A 
11. B 
12. B 
13. C 
14. A 
15. D 
16. D 
17. B