1. What element is present in all organic compounds?
A Oxygen
B. hydrogen
C. carbon
D. helium

2. What are the main elements found in most organic compounds?
A. Aluminum, carbon, and Hydrogen
B. Carbon, Hydrogen and Oxygen
C. Hydrogen, Chlorine and Carbon
D. Carbon, Nitrogen and Oxygen

3. Which of the following pairs of organic compounds is highly flammable?
A. Liquefied Petroleum Gas, kerosene
B. formalin, oil
C. Water, ethyl alcohol
D. vinegar, gasoline

4. Which hydrocarbon compound has a triple bond in the molecule?
A. octane
C. ethyne
B. methane
D. ethane

5. What is the common use of methane?
A fertilizer
B. disinfectant
C. fuel
D.ripening agent

6. How many covalent bonds can each carbon atom formed?
A. 1
B. 2
C. 3
D.4

7. Which of these compounds is an alkene?
A methane
B. butyne
C. propanone
D.ethene

8. Alkanes are hydrocarbons that contain what type of bonds?
A single covalent bonds only
B. at least one triple bond
C. at least one double bond
D. ionic bonds

9. How many carbons are in a molecule of hexane?
A. 3
B. 4
C. 5
D.6

10. What is the name of the alkane having five carbons?
C. octane
A propane
B. methane
D. pentane​