Question 1

Which of the following statements best explains why the C–H bond in methane ($$\mathrm{CH_4$}) is $$considered nonpolar covalent?

Accepted Answer

Because the difference in electronegativity between carbon and hydrogen is less than 0.5.

Question 2

Given the molecular formula $$\mathrm{C_3H_8O}$$, which of the following is a correct statement about its constitutional isomers?

Accepted Answer

They have the same molecular formula but different connectivity of atoms.

Question 3

What is the formal charge on the oxygen atom in the Lewis structure of methanol ($$\mathrm{CH_3OH}$$)?

Accepted Answer

$$0$$

Question 4

Which of the following bonds is the most polar according to the electronegativity values provided?

Accepted Answer

$$\mathrm{O-H}$$

Question 5

Which of the following best describes the geometry and bond angle around the central carbon atom in formaldehyde ($$\mathrm{CH_2O}$$)?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 6

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A triple bond consists of one $$\sigma$$ and two $$\pi$$ bonds.

Question 7

Which of the following molecules will exhibit hydrogen bonding?

Accepted Answer

Methanol ($$\mathrm{CH_3OH})$$

Question 8

Rank the following carbon-carbon bonds in order of increasing bond length: ethane ($$\mathrm{C_2H_6}$$), ethylene ($$\mathrm{C_2H_4}$$), acetylene ($$\mathrm{C_2H_2}).$$

Accepted Answer

Acetylene \u003c Ethylene \u003c Ethane

Question 9

Which of the following solvents is classified as protic?

Accepted Answer

Methanol

Question 10

What is the hybridization of the central carbon atom in acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$sp$$

Question 11

Which of the following factors increases the strength of London dispersion forces in a molecule?

Accepted Answer

Increasing surface area

Question 12

Which of the following best describes the electron configuration of a neutral nitrogen atom ($$Z=7$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^3$$

Question 13

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 14

Which of the following statements about the octet rule is correct?

Accepted Answer

Second-row elements like C, N, O, and F generally obey the octet rule.

Question 15

Which of the following best explains why water ($$\mathrm{H_2O}) $$has a bent molecular geometry?

Accepted Answer

There are two lone pairs on the oxygen atom, causing repulsion.

Question 16

Which of the following is the correct order of increasing boiling point for the following compounds: propane, ethanol, water?

Accepted Answer

Propane \u003c Ethanol \u003c Water

Question 17

Which of the following best describes the bond formed by the side-by-side overlap of two $$p$$ orbitals?

Accepted Answer

Pi ($$\pi) $$bond

Question 18

Which of the following statements about hybridization is correct?

Accepted Answer

$$sp^2$$ hybrid orbitals have 33% $$s$$ character.

Question 19

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) is $$classified as an ionic compound?

Accepted Answer

Because the electronegativity difference between Na and Cl is greater than 1.7.

Electronic Structure and Bonding: Foundations of Organic Chemistry

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