Question 1

Which of the following statements best describes the reaction shown in panel (a) of the diagram, in terms of kinetic and thermodynamic stability?

Accepted Answer

The reaction is kinetically stable and thermodynamically stable.

Question 2

In the context of the reaction energy diagrams, what does $$\Delta G^\ddagger$$ represent?

Accepted Answer

$$\Delta G^\ddagger$$ represents the activation energy, or the energy barrier that must be overcome for the reaction to proceed.

Question 3

Which panel (a, b, c, or d) depicts a reaction that is both thermodynamically and kinetically unstable?

Accepted Answer

Panel b

Question 4

If a reaction has a large $$\Delta G^\ddagger$$ and a negative $$\Delta G^\circ$$, which of the following is true?

Accepted Answer

The reaction is spontaneous but slow.

Question 5

Which panel best represents a reaction that is spontaneous and can occur at low temperatures?

Accepted Answer

Panel a

Question 6

A reaction with a positive $$\Delta G^\circ$$ and a small $$\Delta G^\ddagger is $$best described as:

Accepted Answer

Thermodynamically unstable but kinetically unstable.

Question 7

Which of the following best explains why a reaction with a large $$\Delta G^\ddagger$$ requires high temperature to proceed?

Accepted Answer

High temperature increases the number of molecules with enough energy to overcome the activation barrier.

Question 8

Which panel (a, b, c, or d) shows a reaction that is not spontaneous?

Accepted Answer

Panel c

Question 9

If a reaction is described as 'kinetically stable,' what does this imply about $$\Delta G^\ddagger$$?

Accepted Answer

$$\Delta G^\ddagger is $$large, so the reaction proceeds slowly.

Question 10

Which of the following best describes the relationship between $$\Delta G^\circ$$ and reaction spontaneity?

Accepted Answer

If $$\Delta G^\circ is $$negative, the reaction is spontaneous.

Question 11

A reaction is described as 'thermodynamically stable.' Which of the following must be true?

Accepted Answer

$$\Delta G^\circ is $$positive.

Question 12

Which panel (a, b, c, or d) best represents a reaction that is both thermodynamically and kinetically stable?

Accepted Answer

Panel a

Organic Chemistry Midterm Practice Guidance

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