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1. Which of the following statements is true? a. Biologically important organic molecules never exhibit eatiomrism b. Very few biologically important organic molecules exhibit enantiomerism c. The vast majority of biologically important organic molecules exhibit enantiomerism d. All biologically important organic molecules exhibit enantiomerism 2. If a carbon atom is a stereocenter, which of the following statements must be true about that carbon? a. It has four single bonds b. It has a double bond and two single bonds. It has two double bonds. Any of these bonding arrangements can be associated with a stereocenter c. d. 3. Given the compounds 2,3-dimethylpentane and 2,4-dimethylpentane, which of the following is true? Only 2,3-dimethylpentane is chiral b. Only 2,4-dimethylpentane is chira c. Both are chiral. d. Neither is chiral 4. Given the compounds 2,3-dimethylpentane and 3-methylhexane, which of the following is true? a. Only 2,3-dimethylpentane is chira b. Only 3-methylhexane is chira c. Both are chiral. d. Neither is chira 5. There are four alcohols with the molecular formula CHOH. How many of these are chiral? a. 0 C. 2 d. 3

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