FAC 0025 CHEMISTRY 11 – TEST 2 SECTION A [10 Marks] Section A contains TEN (10) objective questions.Each question carries equal mark. Answer ALL questions. All symbols carry their usual meanings unless indicated otherwise. 1. Which is the IUPAC name for the following compound? a) b) c) d) 2-ethyl-3-methylpentane 3,4-dimethylhexane 2,3-diethylbutane 3-methyl-4-ethylpentane 2. Which alkenes have E configurations? O HO C C H I a) b) c) d) I, II II, III III, IV II, IV C H H II O C OH Cl C C CH3 H3C III CH2Cl Cl H2C C C Cl H3C IV F Br C C I Cl . 2 FAC 0025 3. Which alkene would yield 3-methylpentane when subjected to catalytic hydrogenation? a) b) c) d) e) 4. Which alkene has the highest rate of reaction with HBr? a) Answer d b) c) d) 5. Which compounds contain stereocentres? I) 1-chloropentane II) 2-chloropentane III) 3-chloropentane IV) 1,2-dichloropentane a) b) c) d) I, II III, IV I, III II, IV 3 FAC 0025 6. Using the standard reduction potentials for Calcium and Gold Au3+(aq) + 3 eCa2+(aq) + 2 eAu(s) Ca(s) +1.42 volt -2.76 volt Calculate the value of Eo(cell) for the cell reaction: 2 Au(s) + 3 Ca2+(aq) → 2 Au3+(aq) + 3 Ca(s) a. b. c. d. 7. -1.34 volt +1.34 volt -4.18 volt +4.18 volt Identify the leaving group in the following reaction. S−Na+ I S Na+ + I− a) b) c) d) Na+ CH3CH2I C6H5SCH2CH3 I- 8. Consider the SN2 reaction of butyl bromide with OH- ion. CH3CH2CH2CH2Br + OHCH3CH2CH2CH2OH + Br- Assuming no other changes, what effect on the rate would result from simultaneously doubling the concentrations of both butyl bromide and OHion? a) b) c) d) No effect. It would double the rate. It would triple the rate. It would increase the rate four times. 4 FAC 0025 9. Which is not a polar aprotic solvent? a) b) c) H3C O H3C O H C S O C CH3 CH3 CH3 N d) H3C CH3 CH3 CH OH 10. A galvanic cell is composed of these two half cells, with the standard reduction potentials shown Co2+(aq) + 2 eCd2+(aq) + 2 eCo(s) Cd(s) -0.28 volt -0.40 volt The actual concentrations are: Co2+(aq) = 0.100 M, Cd2+ = 0.0100 M. Calculate the actual potential of this galvanic cell? a. b. c. d. +0.06 volt +0.09 volt +0.15 volt +0.18 volt 5 FAC 0025 SECTION B [15 Marks] Answer ALL questions. All symbols carry their usual meanings unless indicated otherwise. 1. a. Give a detailed reaction mechanism for the reaction expected to occur when 2-bromo-2-methylpentane is heated with sodium methoxide. 1/2 .. : Br : 1/2 H slow .. [ - Br: ] .. 1/4 .. :OCH3 .. fast 1/2 1/2 1/2 1/4 H [3 Marks] b. Indicate the major product in Q1a and justify your answer. 1 is more stable. 1 The second alkene is the major product. The alkene that is more substituted [2 Marks] 6 FAC 0025 2. a. Use reaction (curved) arrows to show the major product for the flowing reaction. 1/2 1/4 + H Br + 1/2 1/4 Br Br H 1/2 b. them For the compound listed below, draw its mirror image and label the enantiomers as R or S isomers. 7 FAC 0025 CHO CHO CH3 1 CH3O C H CH3 C H CH3O R 1/2 S 1/2 [2 Marks] 3. Predict the major product for each of the following reactions: a. Br tBuO K 3 [3 marks] b. Br2 CCl4 Br Br 3 Never mind if not drawn as trans. 8 FAC 0025 [3 marks] 9
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