A 10 b 5 c 3 d 2 e 1 rationale problem 221 14 which

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__ A. 10 __ B. 5 __ C. 3 __ D. 2 __ E. 1 Rationale: Problem 2.21 14. Which of the choices CORRECTLY specifies the types of sidechain interactions by which the sidechains of the pairs of amino acids named can interact with one another? __ A. CysH and CysH sidechains can interact by forming disulfide bridges. __ B. Leu and Val can interact by forming salt bridges. __ C. Phe and Leu sidechains can interact by forming hydrogen bonds. __ D. Arg and His sidechains can interact by forming disulfide bridges. __ E. Tyr and Ser sidechains can interact by forming salt bridges. Rationale: Problem 16.30 8
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15. Two structures are shown below as Fischer projections. What is the relationship between these structures? CH 2 CH 3 CH 2 CH 3 OH H OH H CH 2 CH 3 CH 2 CH 3 H O H H O H __ A. These structures are both of the same identical meso isomer. __ B. The structure on the left is that of a meso compound and the structure on the right is of another stereoisomer. __ C. These are structures of different (nonidentical) meso isomers. __ D. These are structures of enantiomers. __ E. These are structures of diasteriomers. Rationale: Problem 7.22 16. To convert benzene into m-bromoaniline requires reacting benzene with different reagent mixtures in the proper order. If process A is reaction with Br 2 and FeBr 3 , process B is reaction with Sn and HCl followed by NaOH, and process C is reaction with HNO 3 and H 2 SO 4 , in what order should these processes be performed on benzene to create m-bromoaniline? __ A. First A then B then C. __ B. First B then A then C. __ C. First C then A then B. __ D. First C then B then A. __ E. First B then C then A. Rationale: Problem 10.38 9
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17. Find the product of the reaction between methyl benzoate and methylamine shown below. C O OCH 3 + CH 3 NH 2 ? C O NH 2 C O NHCH 3 C O OCH 3 NHCH 3 C O OCH 3 N H 2 C NH OCH 3 1 2 3 4 5 __ A. 1 __ B. 5 __ C. 4 __ D. 3 __ E. 2 Rationale: Problem 13.37 18. How many units of unsaturation are present in the compound whose structure is shown below? O O O __ A. 7 __ B. 10 __ C. 8 __ D. 9 __ E. 20 Rationale: Problem 3.43 10
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19. Look at the structures labelled 1, 2, and 3 below. Choose the statement from the multiple choices which CORRECTLY identifies one or more of these structures. CH 3 CH 3 H H H CH 3 H CH 2 CH 2 CH 3 CH 3 CH 2 H H CH 3 1 2 3 __ A. Structure 2 is least stable isomer of 1-ethyl-3-methylcyclohexane. __ B. The methyl groups in these cyclohexanes are all in equatorial positions. __ C. Structures 1 and 3 are the most stable conformational isomers of the substituted cyclohexanes shown. __ D. Structure 1 is the most stable isomer of 1,2-dimethylcyclohexane. __ E. Structure 2 is the most stable conformational isomer of 1-methyl-3-propylcyclohexane. Rationale: Problem 2.29 20. Choose the correct designations for the type of glycosidic bond and types of monosaccharide units that appear in the disaccharide whose structure is shown below.
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