final exam practice key

final exam practice key - Chem. 610A, Fall 2002, Prof....

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Chem. 610A, Fall 2002, Prof. Krische Final Exam Name: Answer Key Problem 1. (22 points) 2. (18 points) 3. (10 points) 4. (18 points) 5. (16 points) 6. (16 points) Total Points: /100 NMR and IR are not covered on this practice final exam, but will be covered on our final exam. Periodic Table of the Elements H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac ** Rf Db Sg Bh Hs Mt 110 111 112 113 La nthanides * Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ac tinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
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1. (22 points) For each problem below, circle all correct answer(s). Note : more than one answer may be correct. A. (2 points) The order of increasing stability of the carbonium ions A, B, and C is… CH 3 C CH 3 C H 3 CC H A B C H 3 CH 2 H 2 C CH 3 CH 3 CH 2 i) A<B<C ii) C<B<A iii) B<C<A iv) B<A<C v) C<A<B vi) A<C<B B. (2 points) The order of increasing stability of the carbanions A, B, and C is… A B C O O i) A<B<C ii) C<B<A iii) B<C<A iv) B<A<C v) C<A<B vi) A<C<B C. (2 points) Of the following compounds, the one(s) with no net dipole moment are… 1 2 3 4 BF 3 BF 4 CH 3 CH 4 i) only 1 ii) only 1 and 2 iii) only 1, 2 and 3 iv) all (1-4) v) only 2 vi) only 2 and 3 vii) only 2, 3 and 4 viii) only 3 ix) only 3 and 4 x) only 4 xi) only 1 and 4 xii) only 1, 3 and 4
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D. (2 points) In S N 1 and E1 reactions… i) carbonium ion intermediates are always formed. ii) the rate of the reaction depends upon the concentration of nucleophile or base. iii) the rate of the reaction is influenced by solvent polarity changes.
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This note was uploaded on 02/09/2009 for the course CH 318M taught by Professor Bocknack during the Fall '08 term at University of Texas at Austin.

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final exam practice key - Chem. 610A, Fall 2002, Prof....

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