Which of the following is written correctly? A. Fisher projections are typically

Question

Which of the following is written correctly? A. Fisher projections are typically drawn with hydrogens on vertical lines and carbon chains on horizontal lines. B. In the case of a tie, atom priorities are assigned based on the functional groups attached to the next atom in the chain C. When choosing between R and S the highest priority atom should be pointing atom should be pointing toward the viewer. D. Rotation around C = C is typically hindered because of sigma bond overlap E. When numbering carbons in a chain, choose the order that assigns the highest possible numbers to all functional groups Threonine, pictured at right, is an essential amino acid. What are the configurations of each stereocenter in this molecule? A. This compound is meso B. (2S, 3S) C. (2R, 3S) D. (2R, 3R) E. (2R, 3S) Refluxing allows for: A. Gentler reaction conditions B. Chiral synthesis C. Removal of impurities D. Increased reaction temperatures with little solvent loss E. Increased reaction temperatures with little sample loss When converting maleic to fumaric acid, what is the purpose of adding hydrochloric acid? A. Protonates the C = O, allowing for molecular rotation B. Protonates one of the C = C carbons, resulting in breakage of the Product-bond C. Protonates the hydroxyl group allowing for elimination of water D. Causes the maleic acid to be more soluble in water. E. Has no real effect

Explanation / Answer

12) Fischers projection formula are so drwan that, the lowest priority group should remain in the vertical line (i.e.- away from the viewer or plane of paper). In this, context, hydrogen being the lowest priority group, it should remain in vertical line, no matter whether up or down.

Ans- option A

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