Q: Given the rate law $$\text{rate} = k[\text{NO}_2]^2[\text{CO}]$$, what is the order of the reaction with respect to $$\text{NO}_2$$ and the overall order?

$$\text{NO}_2$$: second order; overall: third order

Q: Which of the following is a correct statement about the infrared (IR) absorption of a carbonyl group ($$C=O$$)?

It appears around $$1700\ \text{cm}^{-1}.$$

Q: Which of the following is the correct structure for the enolate ion formed from acetone ($$\text{CH}_3\text{COCH}_3) $$under basic conditions?

$$\text{CH}_2=\text{C}(-\text{O}^-)\text{CH}_3$$

Question 1

Which of the following best describes the effect of a catalyst on the activation energy ($$E_a) $$and the rate constant ($$k) of a $$chemical reaction?

Accepted Answer

A catalyst decreases $$E_a$$ and increases $$k.$$

Question 2

Given the rate law $$	ext{rate} = k[	ext{NO}_2]^2[	ext{CO}]$$, what is the order of the reaction with respect to $$	ext{NO}_2$$ and the overall order?

Accepted Answer

$$	ext{NO}_2$$: second order; overall: third order

Question 3

Which of the following statements about dynamic equilibrium is correct?

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 4

A reaction has a rate constant $$k$$ that doubles when the temperature increases from $$300\ 	ext{K} to$$ $$310\ 	ext{K}. $$Which equation best describes this temperature dependence?

Accepted Answer

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

Question 5

Which of the following is a correct statement about Le Chatelier’s Principle?

Accepted Answer

If the temperature of an exothermic reaction is increased, the equilibrium shifts to favor the reactants.

Question 6

Which of the following compounds is most likely to undergo nucleophilic addition rather than nucleophilic substitution?

Accepted Answer

Aldehyde

Question 7

Which of the following best explains why tertiary carbocations are more stable than primary carbocations?

Accepted Answer

Tertiary carbocations have more hyperconjugation and inductive stabilization.

Question 8

Which of the following is the correct IUPAC name for the compound with the structure $$	ext{CH}_3	ext{CH}_2	ext{COOH}$$?

Accepted Answer

Propanoic acid

Question 9

Which of the following statements about optical activity is correct?

Accepted Answer

A chiral molecule rotates plane-polarized light.

Question 10

Which of the following best describes the product of the reaction between an aldehyde and a primary amine?

Accepted Answer

Imine

Question 11

Which of the following is the correct mechanism for the acid-catalyzed hydration of an alkene?

Accepted Answer

Electrophilic addition

Question 12

Which of the following statements about the SN1 reaction mechanism is correct?

Accepted Answer

The reaction proceeds via a carbocation intermediate.

Question 13

Which of the following is a correct statement about the infrared (IR) absorption of a carbonyl group ($$C=O$$)?

Accepted Answer

It appears around $$1700\ 	ext{cm}^{-1}.$$

Question 14

Which of the following best describes the product of the reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst?

Accepted Answer

Ester

Question 15

Which of the following is the correct formula for the equilibrium constant $$K_c$$ for the reaction $$aA + bB \rightleftharpoons cC + dD$$?

Accepted Answer

$$K_c = \frac{[C]^c[D]^d}{[A]^a[B]^b}$$

Question 16

Which of the following is a correct statement about the effect of increasing temperature on the equilibrium constant $$K_c$$ for an exothermic reaction?

Accepted Answer

$$K_c$$ decreases.

Question 17

Which of the following is the correct structure for the enolate ion formed from acetone ($$	ext{CH}_3	ext{COCH}_3) $$under basic conditions?

Accepted Answer

$$	ext{CH}_2=	ext{C}(-	ext{O}^-)	ext{CH}_3$$

Question 18

Which of the following best explains why carboxylic acids are more acidic than alcohols?

Accepted Answer

Carboxylic acids have resonance stabilization of the conjugate base.

Question 19

Which of the following is the correct product of the reaction between benzene and bromine in the presence of iron(III) bromide?

Accepted Answer

Bromobenzene

Question 20

Which of the following statements about the Diels-Alder reaction is correct?

Accepted Answer

It is a [4+2] cycloaddition reaction.

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