Q: Which of the following statements about the infrared (IR) spectrum of a carboxylic acid is correct?

The C=O stretch appears as a strong peak near $$1700\ \text{cm}^{-1}.$$

Question 1

Which of the following best describes the effect of increasing temperature on the rate constant $$k in $$the Arrhenius equation?

Accepted Answer

The rate constant $$k$$ increases exponentially with increasing temperature, as described by $$k = Ae$$^{-\frac{E_a}$${RT}}.$$

Question 2

A reaction is found to be first order with respect to $$A$$ and second order with respect to $$B. $$Which of the following is the correct rate law for this reaction?

Accepted Answer

$$	ext{rate} = k[A][B]^2$$

Question 3

Which of the following statements about catalysts is correct?

Accepted Answer

Catalysts provide an alternative reaction pathway with a lower activation energy.

Question 4

Which of the following is the correct expression 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 5

A student mixes 1 mol of acetic acid with 1 mol of ethanol in a closed container. After equilibrium is reached, which of the following will increase the yield of ethyl acetate?

Accepted Answer

Removing ethyl acetate as it forms.

Question 6

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

Accepted Answer

Tertiary carbocations have more alkyl groups that donate electron density via hyperconjugation and inductive effects.

Question 7

Which of the following is a correct statement about nucleophilic substitution reactions ($$S_N1$$ and $$S_N2$$)?

Accepted Answer

$$S_N2$$ reactions are favored by primary alkyl halides.

Question 8

Which of the following is the correct IUPAC name for the compound with the structure $$CH_3CH_2COOH$$?

Accepted Answer

Propanoic acid

Question 9

Which of the following statements about optical isomerism is correct?

Accepted Answer

Enantiomers rotate plane-polarized light in opposite directions.

Question 10

Which of the following best describes the mechanism of the reaction between bromine and ethene?

Accepted Answer

Electrophilic addition

Question 11

Which of the following is the correct order of acidity for the following carboxylic acids: formic acid, acetic acid, and propanoic acid?

Accepted Answer

Formic acid \u003e Acetic acid \u003e Propanoic acid

Question 12

Which of the following statements about the infrared (IR) spectrum of a carboxylic acid is correct?

Accepted Answer

The C=O stretch appears as a strong peak near $$1700\ 	ext{cm}^{-1}.$$

Question 13

Which of the following is a correct statement about the hydrolysis of esters?

Accepted Answer

Base-catalyzed hydrolysis of esters produces a carboxylate ion and an alcohol.

Question 14

Which of the following best describes the effect of increasing the concentration of reactants on the position of equilibrium for a reversible reaction?

Accepted Answer

The equilibrium shifts to oppose the change, favoring the formation of products.

Question 15

Which of the following is the correct formula for calculating the $$pK_a of a $$weak acid?

Accepted Answer

$$pK_a = -\log_{10}[K_a]$$

Question 16

Which of the following statements about the $$S_N1$$ mechanism is correct?

Accepted Answer

$$S_N1$$ reactions involve a carbocation intermediate.

Question 17

Which of the following is the correct structure for the product of the reaction between ethanoic acid and ethanol?

Accepted Answer

Ethyl ethanoate

Question 18

Which of the following best describes the effect of a catalyst on the activation energy and the rate of a reaction?

Accepted Answer

A catalyst decreases the activation energy and increases the rate.

Question 19

Which of the following is the correct formula for the rate constant $$k in $$terms of the Arrhenius equation?

Accepted Answer

$$k = Ae$$^{-\frac{E_a}$${RT}}$$

Question 20

Which of the following statements about the effect of temperature on equilibrium is correct?

Accepted Answer

Increasing temperature favors the endothermic direction of a reversible reaction.

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