Q: Which of the following is the correct formula for atom economy?

$$\text{Atom economy} = \dfrac{\text{molecular mass of desired product}}{\text{molecular mass of reactants}} \times 100\%$$

Question 1

Which of the following statements correctly describes an exothermic reaction?

Accepted Answer

It releases heat to its surroundings and has a negative change in enthalpy ($$\Delta H \u003c 0).$$

Question 2

Given the equation $$\Delta G^\circ = -RT \ln K_{eq}$$, what happens to the equilibrium constant $$K_{eq} if$$ $$\Delta G^\circ$$ becomes more negative?

Accepted Answer

The equilibrium constant $$K_{eq}$$ increases.

Question 3

Which of the following is true about the activation energy ($$E_a) in a $$chemical reaction?

Accepted Answer

A higher $$E_a$$ means the reaction will proceed slower.

Question 4

For the reaction $$A + B ightarrow C + D$$, the rate law is $$	ext{rate} = k[A][B]. If $$the concentration of $$A is $$doubled and $$B is $$tripled, by what factor does the rate increase?

Accepted Answer

6

Question 5

Which of the following best describes a chiral carbon?

Accepted Answer

A carbon atom bonded to four different groups.

Question 6

A mixture contains 70% of one enantiomer and 30% of the other. What is the enantiomeric excess ($$ee) of $$the mixture?

Accepted Answer

$$ee = 40\%$$

Question 7

Which of the following is true about meso compounds?

Accepted Answer

They have chiral centers but are achiral overall due to symmetry.

Question 8

Which statement about the Hammond Postulate is correct?

Accepted Answer

For exothermic reactions, the transition state resembles the reactants.

Question 9

Which of the following is the correct formula for atom economy?

Accepted Answer

$$	ext{Atom economy} = \dfrac{	ext{molecular mass of desired product}}{	ext{molecular mass of reactants}} 	imes 100\%$$

Question 10

Which of the following is NOT a characteristic of stereoisomers?

Accepted Answer

They have different molecular formulas.

Question 11

If a reaction is endothermic and bond breaking is the dominant process, what can be said about the bond dissociation energy (BDE)?

Accepted Answer

BDE values will be positive.

Question 12

Which of the following best describes the rate-limiting step in a reaction coordinate diagram?

Accepted Answer

The step with the highest activation energy ($$E_a).$$

Question 13

Which of the following is true about the relationship between $$\Delta G^\circ$$ and the direction of equilibrium?

Accepted Answer

If $$\Delta G^\circ \u003c 0$$, the reaction favors the formation of products.

Question 14

Which of the following is the correct expression for the Arrhenius equation?

Accepted Answer

$$k = Ae$$^{-E_a/RT}$$

Question 15

A compound has two stereocenters and a plane of symmetry. Which of the following best describes this compound?

Accepted Answer

It is a meso compound.

Question 16

Which of the following statements about theoretical yield is correct?

Accepted Answer

It is the maximum amount of product possible from a reaction, based on stoichiometry.

Question 17

Which of the following is true about enantiomers?

Accepted Answer

They are non-superimposable mirror images of each other.

Question 18

Which of the following is the correct formula to express $$\Delta G^\circ in $$terms of $$T$$ and $$K_{eq}$$?

Accepted Answer

$$\Delta G^\circ = -RT \ln K_{eq}$$

Question 19

Which of the following is a correct statement about chirality in molecules without asymmetric (chiral) carbons?

Accepted Answer

Chirality is possible due to the overall arrangement of atoms.

Thermodynamics, Kinetics, and Stereochemistry in Organic Chemistry: Structured Study Notes

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