Question 1

Which of the following molecules would have the highest boiling point due to intermolecular forces?

Accepted Answer

CH\_3CH\_2OH

Question 2

Which statement best explains why acetic acid (CH\_3COOH) is a stronger acid than ethanol (CH\_3CH\_2OH)?

Accepted Answer

The conjugate base of acetic acid is stabilized by resonance.

Question 3

Which of the following functional groups contains a carbonyl group directly bonded to a nitrogen atom?

Accepted Answer

Amide

Question 4

Given the following acids and their pK\_a values, which is the strongest acid?

Accepted Answer

HCl, pK\_a = -7

Question 5

Which factor most directly explains why the boiling point of n-pentane (b.p. 36°C) is higher than that of neopentane (b.p. 10°C)?

Accepted Answer

n-Pentane has a larger molecular surface area, leading to stronger London dispersion forces.

Question 6

Which of the following statements about dipole moments is correct?

Accepted Answer

Dipole moments are measured in units of debye (D).

Question 7

Which of the following is a Lewis acid?

Accepted Answer

BF\_3

Question 8

Which of the following factors increases the acidity of a molecule by stabilizing its conjugate base through electron withdrawal?

Accepted Answer

Inductive effect

Question 9

Which of the following acids has the most stable conjugate base due to the size of the anion?

Accepted Answer

HI

Question 10

Which of the following molecules is capable of hydrogen bonding?

Accepted Answer

CH\_3CH\_2NH\_2

Question 11

Which of the following statements about acid-base reactions is true?

Accepted Answer

Acid-base reactions favor the formation of the weaker acid and weaker base.

Question 12

Which of the following has the lowest pK\_a value?

Accepted Answer

HBr

Question 13

Which of the following best describes the effect of hybridization on the stability of a conjugate base?

Accepted Answer

Non-bonding electrons in an sp orbital are more stable than those in an sp\^2 or sp\^3 orbital.

Question 14

Which of the following is the correct expression for the acid dissociation constant ($$K_a) $$for the reaction $$HA + H_2O \rightleftharpoons A^- + H_3O^+$$?

Accepted Answer

$$K_a = \frac{[A^-][H_3O^+]}{[HA]}$$

Question 15

Which of the following functional groups is present in the structure of an ester?

Accepted Answer

RCOOR'

Question 16

Which of the following statements about resonance stabilization is correct?

Accepted Answer

Resonance stabilization increases the stability of the conjugate base, making the acid stronger.

Question 17

Which of the following is the correct relationship between pK\_a and acid strength?

Accepted Answer

The smaller the pK\_a, the stronger the acid.

Question 18

Which of the following is a Bronsted-Lowry base?

Accepted Answer

NH\_3

Question 19

Which of the following compounds would have the lowest boiling point?

Accepted Answer

Neopentane

Question 20

Which of the following factors is most important in determining the stability of a conjugate base for elements in the same group of the periodic table?

Accepted Answer

Size of the anion

Acids and Bases; Functional Groups – Chapter 2 Study Notes

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