28. Which is the general formula for cyclic hydrocarbons with one double covalent bond between adjacent atoms?
(A) C_nH_2n+2
(B) C_nH_2n
(C) C_nH_2n-2
(D) C_nH_2n-4
(E) C_nH_2n-6

24. What is the major product of the following reaction?(A) (B)(C) (D) (E) None of the above

25. Which one of the following molecular formulae can represent a pair of mirror image isomers? (A) H2NCH2COOH (B) H2NCH(CH3)COOH (C) H2NCH2CH2COOH (D) H2NCH2COOCH3 (E) (CH3)2CHCOOH

26. A chain reaction is one that : (A) involves a series of steps (B) involves two steps with similar energies of activation (C) is initiated by heat (D) requires the addition of an external terminating agent (E) involves a reaction in which the propagation steps also produce the product and initiator necessary for another propagation cycle

27. Which statement best describes 1,3-butadiene? (A) 1,3-butadiene is less stable than 1,4-pentadiene due to steric crowding. (B) 1,3-butadiene is more stable than 1,4-pentadiene because of less steric crowding. (C) 1,3-butadiene is less stable than two molecules of 1-butene. (D) 1,3-butadiene is more stable than 1,4-pentadiene due to resonance energy. (E) 1,3-butadiene’s carbon atoms are sp3 hybridized.

29. What is the major product of the following reaction? (A) (S) 2-butanol (B) (R)2-butanol (C) racemic mixture of 2-butanol (D) e.e of (S)-butanol (E) diastereomeric mixture of 2-butanol

30. How many absorptions will the following compound have in its carbon NMR spectrum? (A) 3 (B) 4 (C) 5 (D) 6 (E) 7

31. The pinacol rearrangement proceeds via              intermediate. (A) carbanion (B) carbocation (C) radical (D) lone pair (E) neutral

32. Rank the following compounds with respect to increasing acidity (least acidic to most acidic). (A) 3＜1＜2＜5＜5 (B) 4＜3＜1＜2＜5 (C) 4＜3＜1＜2＜5 (D) 5＜2＜1＜3＜4 (E) 4＜5＜2＜1＜3

33. What is the product of the following reaction: (A) (B) (C) (D) All of the above (E) Pentane

34. What is the stereochemistry of the following compound: (A) R-form (B) S-form (C) not chiral (D) meso compound (E) racemic mixture