Question 1

Which of the following statements best describes a Brønsted-Lowry acid?

Accepted Answer

A substance that donates a proton ($$\mathrm{H^+}) in a $$chemical reaction.

Question 2

Calculate the pH of a $$0.01\ \mathrm{M}$$ solution of hydrochloric acid ($$\mathrm{HCl}$$), assuming complete dissociation.

Accepted Answer

$$\mathrm{pH} = 2$$

Question 3

Which equation correctly represents the ionic product of water ($$K_w) at$$ $$25^\circ\mathrm{C}$$?

Accepted Answer

$$K_w = [\mathrm{H^+}][\mathrm{OH^-}]$$

Question 4

A buffer solution is prepared by mixing acetic acid and sodium acetate. Which of the following best explains how this buffer resists changes in pH when a small amount of acid is added?

Accepted Answer

The acetate ions react with the added $$\mathrm{H^+} to $$form acetic acid, minimizing the pH change.

Question 5

Which indicator would be most suitable for a titration between a strong acid and a strong base?

Accepted Answer

Phenolphthalein

Question 6

Which of the following compounds is chiral?

Accepted Answer

2-butanol

Question 7

Which statement about enantiomers is correct?

Accepted Answer

They have identical physical properties except for the direction in which they rotate plane-polarized light.

Question 8

A carbonyl compound undergoes nucleophilic addition with $$\mathrm{$$NaBH_4$$}. $$What is the product when the starting material is propanone?

Accepted Answer

2-propanol

Question 9

Which of the following best describes the physical properties of carboxylic acids?

Accepted Answer

They have higher boiling points than corresponding alcohols due to hydrogen bonding.

Question 10

Which reagent can be used to convert a carboxylic acid to an ester?

Accepted Answer

Alcohol and concentrated $$\mathrm{H_2SO_4}$$

Question 11

Which of the following is a correct statement about acyl chlorides?

Accepted Answer

They react vigorously with water to produce carboxylic acids and $$\mathrm{HCl}.$$

Question 12

Which technique would be most suitable for separating a mixture of amino acids?

Accepted Answer

Paper chromatography

Question 13

In $$^1\mathrm{H}$$ NMR spectroscopy, what does the splitting pattern of a signal indicate?

Accepted Answer

The number of neighboring (adjacent) hydrogen atoms

Question 14

Which of the following best explains why optical activity is lost when a racemic mixture is formed?

Accepted Answer

The two enantiomers rotate plane-polarized light in equal and opposite directions, resulting in no net rotation.

Question 15

Which of the following is a product of the oxidation of a primary alcohol?

Accepted Answer

Aldehyde

Question 16

Which of the following statements about polyesters is correct?

Accepted Answer

They are formed by the condensation reaction between a dicarboxylic acid and a diol.

Question 17

Which of the following best describes the principle of mass spectrometry?

Accepted Answer

It separates ions based on their mass-to-charge ratio ($$m/z).$$

Question 18

A student analyzes a mixture using gas chromatography (GC). What does the area under each peak in the chromatogram represent?

Accepted Answer

The relative amount of each component in the mixture

Question 19

Which of the following is a correct interpretation of a $$^1\mathrm{H}$$ NMR spectrum with a singlet at $$\delta = 2.1$$ ppm integrating for 3 hydrogens?

Accepted Answer

A methyl group ($$\mathrm{CH_3$}) $$with no adjacent hydrogens

Acid-Base Equilibria, Carbonyls, Carboxylic Acids, Chirality, and Spectroscopy: Study Guide

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