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

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.

28. Which is the general formula for cyclic hydrocarbons with one double covalent bond between adjacent atoms? (A) CnH2n+2 (B) CnH2n (C) CnH2n-2 (D) CnH2n-4 (E) CnH2n-6

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

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

35. What is the name of the compound whose line drawing is shown below?  (A) 3-ethyl-4-methyl-2-hexanol (B) 4-ethyl-3-methyl-5-hexanol (C) 3,4-diethyl-2-pentanol (D) 2,3-diethyl-4-pentanol (E) 3-iso-buty1-2-pentanol

36. Which of the following statements is correct? (A) Alkenes have only sp2 hybridised carbon atoms. (B) Alkenes will react with ozone to give carbonyl compounds. (C) Amines can react with carboxylic acids to give esters. (D) Tertiary alcohols will oxidise to ketones. (E) Bromobenzene will undergo an SN2 substitution reaction

37. Which of the following alkyl bromides will undergo the SN2 reaction the fastest? (A) Bromobenzene (B) Butyl bromide (C) tert-Butyl bromide (D) iso-butyl bromide (E) 1-Bromo-4-nitrobenzene