20. Give the product for the following reaction.

(A) alanine
(B) leucine
(C) valine
(D) isoleucine
(E) glycine

21. Which of the following statements correctly describes the contribution of △S° to△G°?(A) The entropy term makes a greater contribution to AG° at high temperatures.(B) The entropy term makes a greater contribution to AG° at low temperatures.(C) The entropy term makes a greater contribution to AG° in exothermic reactions.(D) The entropy term makes a greater contribution to AG° in endothermic reactions.(E) The entropy term always makes a more significant contribution to AG° than does the enthalpy term.

22. What compound is produced when N,N-dimethylpropanamide is treated with LiAlH4?(A) CH3CH2CONH₂ (B) CH3CH2CH2NH2(C) CH3CH2CH2OH(D) CH3CH2CH2N(CH3)2 (E) CH3CH2N(CH3)2

23. Which ofthe following is a vicinal dihalide?(A) cis-1,2-dibromocyclopentane(B) 3,3-dichloropentane(C) trans-1,4-diiodocyclohexane(D) isobutyl chloride(E) 1,3-dibromoheptane

24. Reduction of a 2-ketohexose with NaBH4 yields:(A) a single aldohexose (B) a mixture of acetals (C) a mixture of alditols(D) a mixture of pyranoses (E) a mixture of cyclic hemiacetals

25. When the 1,7-diester CH3O2CCH2CH2CH(CH3)CH2CH2CO2CH3 is treated with sodium methoxide and the reaction mixture issubsequently neutralized with acid, what kind of compound is the major organic product?(A) a cyclic ẞ-diketone (B) a cyclic ẞ-ketoester (C) an acyclic ẞ-diester(D) an acyclic ẞ-ketoacid (E) a cyclic ẞ-diketone

26. When thiols form disulfide bonds, the reaction can be described as_____.(A) elimination(B) sulfation(C) sulfonation(D) oxidation(E) reduction

27. Which of the following compounds will not undergo Friedel-Crafts acylation when treated with CH3CH2COC1, AlCl3?(A) toluene (B) p-xylene (C) anisole (D) benzophenone (E) ethoxybenzene

28. What is the major product when (CH3)2CHCH2CH,Br is subjected to the following reaction sequence: (i) Mg, (ii) CO2, (iii) H3O+?(A) 3-methyl-1-butanol (B) 2-methyl-2-butanol (C) 4-methyl-1-pentanol(D) 4-methylpentanoic acid (E) 3-methylbutanoic acid

29. If a signal is observed in the 170 to 200 ppm range in a C-13 NMR spectrum, what is the most likely type of functional group associated with that carbon atom? (A) carbonyl carbon(B) allylic carbon (C) aromatic carbon (D) carbon/carbon triple bond(E) carbon/carbon double bond

30.Which ofthe following reagents is used in the following reaction?(A) Cl2/CCI4 (B) HCI (C) Cl2/hv (D) HCIO4 (E) PC15

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