1. Calculate the number of elements of unsaturation implied by the molecular formula: a. C9H12 b. C4H4Cl2 c. C6H8O2 2. Give the IUPAC names of the following alkenes CH3 CHH, CH;)2 a. b. CH3 H3 3. Draw the structure of the following alkenes. a. 3-methylpent-2-ene b. hexa-2,4-diene c. 2,4-dibromocyclopentene d. 3-bromo-2-chloropent-2-ene e. 3-ethyl-5-methyloct-3-ene f. 3-bromo-2-methylhex-3-ene 4. Which among the following compounds can show cis and trans isomers. a. 3-methylpent-2-ene b. hexa-2,4-diene c. 2,4-dibromocyclopentene 5. Which among the following compounds can show E-Z system. a. 3-bromo-2-chloropent-2-ene b. 3-ethyl-5-methyloct-3-ene c. 3-bromo-2-methylhex-3-ene