1. What are two requirements for aromaticity in conjugated molecular pi-systems?
2. What type of hybrid orbital is required to have a conjugated molecule? Explain your reasoning in terms of covalent bonding.
3. Why does olive oil have a lower melting point than margarine?
4. Why is bromine often used to determine molecular degree of unsaturation?
Solution.
1. What are two requirements for aromaticity in conjugated molecular pi-systems? 2. What type of hybrid...
1. What type of hybrid orbital is required to have a conjugated molecule? Explain your reasoning in terms of covalent bonding. 2. Heptane vs. 1-Octadecene, which, if any, of the hydrocarbons is soluble in isopropanol? Why? 3. Heptane vs. 1-Octadecene, which of the hydrocarbons is soluble in benzene (C6H6). Why? 4. Heptane vs. 1-Octadecene, which had only sp2 hybrid orbitals? Which had only sp3? Which molecule had both?
1. Double bonds are the only type of unsaturation observed in hydrocarbons. True False 2. Hydrogenation increases a hydrocarbon's degree of unsaturation. True False 3. Margarine has a lower degree of unsaturation than a liquid cooking oil, such as olive oil. True False 4. Oil, gasoline, and natural gas are all examples of: Hydrocarbons. Carbohydrates. Pure substances. Aromatic compounds. 5.Hydrocarbons are nonpolar, meaning they interact with one another via which intermolecular force? London Dispersion. Dipole-Dipole. Hydrogen bonding. Covalent bonding.
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...