CHEM 2612 PRACTICE ERAM 2SMITH ORGANIC CHEMISTRY CHAPTERS 1-7. EMPHASIS ON CHAPTERS 4-7Bach midterm exam will have 30 questions. They will be in the format of this exam.I do not post answers because the point of a practice exam is for you to check yourknowledge and to re-read and understand the principles underlying any question aboutwhich you are unsure. If you have questions, see the tutor or I will be happy to point you inthe right direction after class or during office hours. The SI tutor will hold a pre-exam helpsession as well.1.Match each definition to one of the terms below, Place the letter of the term in theblank to the left of the definition.heterolytic bond breakageelimination reactionhomolytic bond breakage4 polar reaction5 addition reaction6 radical reaction7 electrophile8 nucleophile9.substitutiona.A process involving symmetrical bond breaking and bond making.This occurs when both bonding electrons remain with one product fragment.A reaction where two reactants exchange parts to give two new products.A general term for species which have electron rich sites that can form a bondby donating a pair of electrons to an electron poor site.A general reaction in which a starting material is transformed into twob.C.d.е.products.2.Which, if any, of the names shown is correct for:toa. isopentadienec. 2-methyl-1,3-butadiene d. 2-methyl-2,3-butadienee. isobutadieneb. 3-methyl-1,3-butadieneThe compound CH3-CHCI-CH2-CH=CH-CH2-CH3 contains a single asymmetric centerand a double bond. How many stereoisomers of it exist?а. 13.b. 2с. 3d. 4 e. 5A correct name for the compound shown isa. 2-bromo-4-ethyl-3,3,5,5-tetramethyloctaneb. 7-bromo-3-ethyl-2,2,5,5-tetramethyloctane CH3-CH-CH2 C-CH2-CH-CH2-CH3c. 7-bromo-3-ethyl-2,3,5-trimethylnonaned. 2-bromo-6-ethyl-4,4,6,6-tetramethyloctanee. None of the above4.CH3CH3C(CH3)3The carbon-carbon triple bond of an alkyne is composed ofa. three o bonds.C.One o bond and two tt bonds.e. None of the above is correct.5.b. two o bonds and one t bond.d. three t bonds.-1- e. If a secondary halide reacts with a nucleophile, it must be S2 and not Sl.23.Name the compound shown in the ball and stickmetaphor. Chlorine is green and bromine is darkred.24.The energy peak in a reaction diagram for an S2reaction is calledThe equilbriantOhe transition statee. The activation complexb. The maximumd. The intermediate25.Which of the following is(are) an electrophile(s)?a. H30*b. InClac. NH3d. CH2=CH2e. 0z26.Which of the following is not a nucleophile?a. Cyclohexenec. CH2=CH-CIe. NaSHb. CH3-C=C-CH3d. Ammonia27.Which, if any, statement concerning the graph shown istrue?a. The reaction is exothermicb. The reaction is endothermicc. The arrow in the center points to the intermediate.d. The equilibrium constant for the reaction is: K = E, log [AH]²e. The entropy for this reaction is reversed.Is the reaction shown an example ofa. additionb. eliminationC. substitutiond. rearrangemente. None of the above28.Br2BrcatalystIs the reaction shown an example ofa. additiond. rearrangement29.b. elimination c.substitutione. None of the aboveNaNgH30.The reaction of isopropyl bromide with sodium methoxide to give methyl isopropylethera. could occur by an Sy1 mechanism.-5–

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I will be haPpy to point you in office hours. The SI tutor will hold a pre-exam help 1. Match each definition to one of the terms below. Place the letter of the term in the blank to the left of the definition. heterolytic bond breakage 2 elimination reaction 4 polar reaction 7 electrophile 5 addition reaction 6 radical reaction 8 nucleophile 9 substitution homolytic bond breakage A process involving symmetrical bond breaking and bond making. This occurs when both bonding electrons remain with one product fragment. A reaction where two reactants exchange parts to give two new products. A general term for species which have electron rich sites that can form a bond by donating a pair of electrons to an electron poor site. A general reaction in which a starting material is transformed into two products. a. b. с. d. e. 123

I will be haPpy to point you in office hours. The SI tutor will hold a pre-exam help 1. Match each definition to one of the terms below. Place the letter of the term in the blank to the left of the definition. heterolytic bond breakage 2 elimination reaction 4 polar reaction 7 electrophile 5 addition reaction 6 radical reaction 8 nucleophile 9 substitution homolytic bond breakage A process involving symmetrical bond breaking and bond making. This occurs when both bonding electrons remain with one product fragment. A reaction where two reactants exchange parts to give two new products. A general term for species which have electron rich sites that can form a bond by donating a pair of electrons to an electron poor site. A general reaction in which a starting material is transformed into two products. a. b. с. d. e. 123

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter14: Elimination

Section: Chapter Questions

Problem 18CTQ

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