1. Which of the following statements best describe organic compounds? A. Organic compounds are compounds that contain carbon and oxygen only B. Organic compounds are compounds that are produced by living things C. Organic compounds are composed mainly of carbon and hydrogen D. Organic compounds are compounds that contain carbon atoms only 2. How do carbon atoms form many organic compounds? A. By attracting other elements toward themselves to form the bonds B. By forming many bonds with other carbon atoms and other elements C. By sharing their electrons with other metal and non-metal elements D. By transferring their electrons to the atoms of surrounding elements 3. How many valence electron does carbon has? A. 2 B. 3 C. 4 D. 5 4. Which hydrocarbon compound has a triple bond in its molecule? A. 2-octene B. ethene C. ethyne D. methane
