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- 5-56 Identify the indicated hydrogens in the following molecules as pro-R or pro-S: (a) (b) (c) H H H H CO2H CH3S. CO, .CO2 HO2C HS но н H H H3N H H3N H Malic acid Methionine Cysteine(1) C (CH ),CO K (CH2),COH Сн,о- Д НО AQ5. For each of the cases (a - c) shown below, indicate which specie is the most stable and why? (a) or 1 2 (b) (c) CH3 or CF3 CH3 or N. CH3 1 2 1
- From the data in Figure 4-12 and Table 4-1, estimate the percentages of molecules that have their substituents in an axial orientation for the following compounds: (a) Isopropylcyclohexane (b) Fluorocyclohexane (c) Cyclohexanecarbonitrile, C6H11CN5-34 Eight alcohols have the formula C5H120. Draw them. Which are chiral? 5-35 Draw compounds that fit the following descriptions: (a) A chiral alcohol with four carbons (b) A chiral carboxylic acid with the formula C5H1002 (c) A compound with two chirality centers (d) A chiral aldehyde with the formula C3H5BrO5-54 Ribose, an essential part of ribonucleic acid (RNA), has the following structure: H H H OH CHO Ribose Но но н но н (a) How many chirality centers does ribose have? Identify them. (b) How many stereoisomers of ribose are there? (c) Draw the structure of the enantiomer of ribose. (d) Draw the structure of a diastereomer of ribose.
- Q-11. Rank these compounds from lowest to highest energy. C(CH3)3 C(CH3)3 (A) IIdentify the correct structure below that represents the following molecule: (3E,5 E)-6-chloro-3,5-octadien-1-ol CI HO CI OH CI OH CI OH CI OHThe first resonance structure of acetamide, CH3 CONH2, is shown. H :0: ☐ || H-C-C-N-H H H Determine the correct second resonance structure of acetamide. H :0: -1 +1 H-C-C-N-H H H H :0: -1 ☐ ☐ H-C=C-N-H H H H :0: H-C-N-C-H HH ●● -1 H:0: H H-C-C=N—H H HSEE MORE QUESTIONS