35. These two molecules are best described as: COOH HOOC A. enantiomers B. isoto
ID: 151519 • Letter: 3
Question
35. These two molecules are best described as: COOH HOOC A. enantiomers B. isotopes C. a cis-trans pair D. hydrocarbons E. structural isomers 36. The bonds responsible for holding Na and Cl atoms together in a NaCl crystal are: A. covalent bonds B. ionic bonds C. H-bonds D. waterE. none of the above 37. Which of the following statements is true for starch and cellulose? A. they are geometrical isomers of each other B. both are polymers of glucose C. both provide energy to the human diet D. both are components of plant cell walls E. all of the above 38. Triglycerides containing only saturated fatty acids: A. have at least one trans double bond B. have no C-C double bonds C. are usually liquid at room temperature D. are most commonly produced by plants E. have at least one cis double bondExplanation / Answer
35. Option A is the correct answer. Enantiomers are nonsuperimposable mirror images of each other. They differ only as does the right hand from the left.
36. Option B is correct. Ionic bond is formed of shifting of electrons while covalent bond forms by sharing of electron. During the formation of NaCl, one electron from NaCl is donated to the Cl. Since Na has one electron in its outermost orbit it acquire its octate state and Cl has 7 electrons in its outermost orbit, Cl also acquire its octate state after shifting of electron. Thus, the bond involved in formation of NaCl is ionic bond.
37. Option B is correct. Cellulose and starch both are polymer of glucose and the difference is, the starch is formed by polymerization of alpha glucose while cellulose is formed by polymerization of beta glucose. Alpha and beta glucose are not the type of cis-trans isomer rather these are rotamers. Starch is not the component of cell wall, celulose is the component of cell wall. Cellulose do not provide energy to the human diet because human cannot digest cellulose.
38. Option B is correct. Saturated fatty acids do not contain double bonds.
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