Question 1

Which of the following molecules has the highest dipole moment?

Accepted Answer

Water ($$H_2O)$$

Question 2

Which hybridization is present in the central atom of ethene ($$C_2H_4$$)?

Accepted Answer

$$sp^2$$

Question 3

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual molecule is a hybrid of all valid resonance structures.

Question 4

Which of the following acids is the strongest Bronsted acid?

Accepted Answer

Hydrochloric acid ($$HCl)$$

Question 5

A molecule has a tetrahedral electron geometry and a bond angle of approximately $$109.5^	ext{o}. $$Which hybridization does the central atom have?

Accepted Answer

$$sp^3$$

Question 6

Which of the following best explains why $$NH_3$$ has a higher boiling point than $$CH_4$$?

Accepted Answer

$$NH_3$$ forms hydrogen bonds, while $$CH_4$$ does not.

Question 7

Which of the following is the correct order of increasing acidity?

Accepted Answer

$$CH_4$$ \u003c $$NH_3$$ \u003c H_2O \u003c HF$$

Question 8

Which of the following statements about formal charge is correct?

Accepted Answer

Formal charge is calculated as the difference between the number of valence electrons in the free atom and the number assigned to the atom in the molecule.

Question 9

Which of the following is a correct statement about the solubility of ionic compounds in water?

Accepted Answer

Solubility depends on the balance between lattice energy and hydration energy.

Question 10

Which of the following best describes the relationship between electronegativity and bond polarity?

Accepted Answer

The greater the difference in electronegativity, the more polar the bond.

Question 11

Which of the following is the best Lewis base?

Accepted Answer

Ammonia ($$NH_3)$$

Question 12

Which of the following is the correct electron configuration for the carbon atom in methane ($$CH_4$$)?

Accepted Answer

$$1s^2$$ $$(sp^3)^4$

Question 13

Which of the following is the best explanation for why $$F^- is a $$weaker base than $$OH^-$$?

Accepted Answer

$$F^- is $$more stable due to its higher electronegativity.

Question 14

Which of the following molecules is expected to have the largest bond angle?

Accepted Answer

Beryllium chloride ($$BeCl_2)$$

Question 15

Which of the following is the best description of a nucleophile?

Accepted Answer

A species that donates a pair of electrons to form a new bond.

Question 16

Which of the following is the most stable resonance structure for the acetate ion ($$CH_3COO^-$$)?

Accepted Answer

The structure with the negative charge delocalized over both oxygen atoms.

Question 17

Which of the following best explains why $$NaCl$$ dissolves readily in water?

Accepted Answer

The hydration energy of $$Na^+$$ and $$Cl^-$$ ions compensates for the lattice energy.

Question 18

Which of the following is the correct order of increasing basicity?

Accepted Answer

$$Cl^- \u003c OH^- \u003c NH_2$^-$$

Question 19

Which of the following best describes the effect of resonance on the stability of a molecule?

Accepted Answer

Resonance increases the stability by delocalizing electrons.

Question 20

Which of the following is the best explanation for the difference in boiling points between $$H_2O$$ and $$H_2S$$?

Accepted Answer

$$H_2O$$ has stronger hydrogen bonding than $$H_2S.$$

Organic Chemistry Study Guide: Electronegativity, Bonding, Acids/Bases, and Molecular Structure

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