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Exam-2-key-1 - 1(30 pts True or False a A molecule can be...

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Exam-2-key.doc page 2 1. (30 pts) True or False. a) A molecule can be achiral even though it does not have a plane of symmetry. True b) A planar molecule can never be chiral. True c) A carbon atom attached to three different groups may also be chiral. False d) Inversion of configuration always happens in an S N 2 reaction. True e) An S N 1 reaction leads to both retention and inversion of configuration. True f) A bond-breaking reaction is exothermic. False g) The E1 reaction is favored in aprotic, polar solvents. False h) A good nucleophile but weak base promotes E2 reactions. False i) The rate of a reaction is determined by the free energy difference between the products and the reactants. False j) In an exothermic reaction, the transition state is usually more similar to the reactant(s). True
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Exam-2-key.doc page 3 2. (20 pts) Name these C 4 H 8 isomers in IUPAC form. (The names should all be different!) A : 1-butene (or but-1-ene) B : [( E )-2-butene (or ( E )-but-2-ene)]; [ trans -2-butene (or trans -but-2-ene)] C : [( Z )-2-butene (or ( Z )-but-2-ene)]; [ cis -2-butene (or cis -but-2-ene)] D :
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