54968550-Practice-Problems-for-Chapter-6-With-Answers-1[1]

54968550-Practice-Problems-for-Chapter-6-With-Answers-1[1]...

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Unformatted text preview: Chapter 6 MULTIPLE CHOICE QUESTIONS Topic: Reaction kinetics 1. Consider the S N 2 reaction of butyl bromide with OH- ion. CH 3 CH 2 CH 2 CH 2 Br + OH- CH 3 CH 2 CH 2 CH 2 OH + Br- Assuming no other changes, what effect on the rate would result from simultaneously doubling the concentrations of both butyl bromide and OH- ion? A) No effect. B) It would double the rate. C) It would triple the rate. D) It would increase the rate four times. E) It would increase the rate six times. Ans: D Topic: Reaction kinetics 2. Consider the S N 2 reaction of 2-iodopentane with CH 3 CO 2- ion. I ONa O O O NaI Assuming no other changes, what effect on the rate would result from simultaneously doubling the concentrations of both 2-iodopentane and CH 3 CO 2- ion? A) No effect. B) It would double the rate. C) It would triple the rate. D) It would increase the rate four times. E) It would increase the rate six times. Ans: D 161 Chapter 6 Topic: Reaction kinetics 3. Consider the S N 2 reaction of 1-chloro-5-methylhexane with CN- ion. Cl NaCN CN NaCl Assuming no other changes, what effect on the rate would result from simultaneously doubling the concentrations of both 1-chloro-5-methylhexane and CN- ion? A) No effect. B) It would double the rate. C) It would triple the rate. D) It would increase the rate four times. E) It would increase the rate six times. Ans: D Topic: Reaction kinetics 4. Select the rate law for the following reaction, e.g., CH 3 CH 2 CH 2 CHBrCH 3 + OH- CH 3 CH 2 CH 2 CHOHCH 3 + X- ( RBr ) A) Rate = k [RBr] B) Rate = k [RBr] [OH- ] C) Rate = k [RBr] 2 [OH- ] D) Rate = k [RBr] [OH- ] 2 E) Rate = k [RBr] 2 [OH- ] 2 Ans: B Topic: Activation Energy 5. Increasing the temperature of a chemical reaction usually increases greatly the rate of the reaction. The most important reason for this is that increasing the temperature: A) Increases the collision frequency. B) Decreases the probability factor. C) Increases the fraction of collisions with energy greater than E act . D) Decreases the energy of activation. E) Makes the reaction more exothermic Ans: C 162 Chapter 6 Topic: Activation Energy 6. Increasing the temperature of a chemical reaction usually increases greatly the rate of the reaction. The primary reason for this is that increasing the temperature: A) Decreases the energy of activation. B) Increases the total number of collisions between reactants C) Decreases the rate of the reverse reaction. D) Favors endothermic processes. E) None of the above properly explains the observed increase in reaction rates with increase in temperature. Ans: E Topic: Reaction Kinetics 7. The rate equation for a nucleophilic substitution reaction of a tertiary alkyl bromide (R- Br) with I- ion would be: A) Rate = k [RBr] B) Rate = k [I- ] C) Rate = k [RBr][I- ] D) Rate = k [RBr] 2 [I- ] E) Rate = k [RBr][I- ] 2 Ans: A Topic: Reaction Kinetics 8. The rate equation for a nucleophilic substitution reaction of a secondary alkyl chloride (R-Cl) with I...
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This note was uploaded on 11/27/2011 for the course CHEM 6210 taught by Professor Wang during the Spring '11 term at University of New Orleans.

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54968550-Practice-Problems-for-Chapter-6-With-Answers-1[1]...

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