Question 1

Which of the following is not true concerning the strength of a nucleophile?

Accepted Answer

A)  Nucleophilicity may not parallel basicity.
B)  Negatively charged nucleophiles are always more reactive than their conjugate acids.
C)  The greater the strength of a nucleophile,the faster an SN2 reaction will occur.
D)  Strong bases are always good nucleophiles
E)  None of these answer choices are correct.F) A) and B)
G) A) and C)

Question 2

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

Accepted Answer

A)  increases the collision frequency.
B)  decreases the probability factor.
C)  increases the fraction of collisions with energy greater than Eact.
D)  decreases the energy of activation.
E)  makes the reaction more exothermic.F) A) and B)
G) D) and E)

Question 3

A true statement about the transition state(s) of an SN2 reaction is:

Accepted Answer

A)  The two transition states are of unequal energy.
B)  The transition states precede and follow an unstable reaction intermediate.
C)  The single transition state represents the point of maximum free energy of the reaction.
D)  Existence of this transition state implies an exothermic reaction.
E)  The transition state will always have a net charge of -1.F) A) and B)
G) None of the above

Question 4

The difference in the bond energies of reactants and the transition state of a reaction is designated by the notation:

Accepted Answer

A)  " Δ\DeltaΔ H ∘\circ∘ "
B)  " Δ\DeltaΔ H‡"
C)  " Δ\DeltaΔ G ∘\circ∘ "
D)  " Δ\DeltaΔ G‡"
E)  " Δ\DeltaΔ S‡" F) All of the above
G) B) and C)

Question 5

Which of the following alkyl bromide isomers would most readily undergo an SN2 reaction?

Accepted Answer

A)  bromocyclobutane
B)  4-bromo-1-butene
C)  3-bromo-1-butene
D)  1-bromo-1-butene
E)  All will react at the same rate.F) B) and E)
G) B) and D)

Question 6

The reaction, -1;  \Delta S = 54.4 J K-1 mol-1.What is the value of  \Delta G for this reaction? A) -73.8 kJ mol-1 B) -76.8 kJ mol-1 C) -59.0 kJ mol-1 D) +91.6 kJ mol-1 E) -91.6 kJ mol-1 " class="answers-bank-image d-inline" rel="preload" > has the following thermodynamic values at 27.0 ºC:  Δ\DeltaΔ H = -75.3 kJ mol-1;  Δ\DeltaΔ S = 54.4 J K-1 mol-1.What is the value of  Δ\DeltaΔ G for this reaction?

Accepted Answer

A)  -73.8 kJ mol-1
B)  -76.8 kJ mol-1
C)  -59.0 kJ mol-1
D)  +91.6 kJ mol-1
E)  -91.6 kJ mol-1 F) A) and C)
G) A) and E)

Question 7

An increase in the kinetic energy of reacting molecules results in

Accepted Answer

A)  a decrease in reaction rate.
B)  an increase in the probability factor.
C)  a decrease in the probability factor.
D)  an increase in the reaction rate.
E)  no changes.F) None of the above
G) All of the above

Question 8

Select the potential energy diagram that represents a two-step endothermic (endergonic) reaction.

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) A) and B)
G) A) and C)

Question 9

Increasing the temperature of a reaction will speed up the overall rate as this will increase the energy of activation for reaction.

Accepted Answer

A) True 
 B)False

Question 10

Which is the weakest nucleophile in polar aprotic solvents?

Accepted Answer

A)  I-
B)  Br-
C)  Cl-
D)  F-
E)  All of these choices are equally strong nucleophiles,regardless of the type of solvent used.F) A) and E)
G) A) and D)

Question 11

In a highly exergonic SN2 reaction we can assume the transition state is similar to the products formed in the reaction.

Accepted Answer

A) True 
 B)False

Exam 6: Nucleophilic Reactions

An increase in the kinetic energy of reacting molecules results in

Correct Answer
verified

Increasing the temperature of a reaction will speed up the overall rate as this will increase the energy of activation for reaction.

Correct Answer
verified

Which of the following is not true concerning the strength of a nucleophile?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Select the potential energy diagram that represents a two-step endothermic (endergonic) reaction.

Correct Answer
verified

The difference in the bond energies of reactants and the transition state of a reaction is designated by the notation:

Correct Answer
verified

A true statement about the transition state(s) of an S_N2 reaction is:

Correct Answer
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In a highly exergonic S_N2 reaction we can assume the transition state is similar to the products formed in the reaction.

Correct Answer
verified

Which of the following alkyl bromide isomers would most readily undergo an S_N2 reaction?

Correct Answer
verified

Which is the weakest nucleophile in polar aprotic solvents?

Correct Answer
verified

Exam 6: Nucleophilic Reactions

An increase in the kinetic energy of reacting molecules results in

Correct AnswerverifiedShow Answer

Increasing the temperature of a reaction will speed up the overall rate as this will increase the energy of activation for reaction.

Correct AnswerverifiedShow Answer

Which of the following is not true concerning the strength of a nucleophile?

Correct AnswerverifiedShow Answer

The reaction, has the following thermodynamic values at 27.0 ºC: Δ\DeltaΔ H = -75.3 kJ mol-1; Δ\DeltaΔ S = 54.4 J K-1 mol-1.What is the value of Δ\DeltaΔ G for this reaction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the potential energy diagram that represents a two-step endothermic (endergonic) reaction.

Correct AnswerverifiedShow Answer

The difference in the bond energies of reactants and the transition state of a reaction is designated by the notation:

Correct AnswerverifiedShow Answer

A true statement about the transition state(s) of an SN2 reaction is:

Correct AnswerverifiedShow Answer

In a highly exergonic SN2 reaction we can assume the transition state is similar to the products formed in the reaction.

Correct AnswerverifiedShow Answer

Which of the following alkyl bromide isomers would most readily undergo an SN2 reaction?

Correct AnswerverifiedShow Answer

Which is the weakest nucleophile in polar aprotic solvents?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A true statement about the transition state(s) of an S_N2 reaction is:

Correct Answer
verified

In a highly exergonic S_N2 reaction we can assume the transition state is similar to the products formed in the reaction.

Correct Answer
verified

Which of the following alkyl bromide isomers would most readily undergo an S_N2 reaction?

Correct Answer
verified

Correct Answer
verified