Question 1

Which of the following statements best explains why water ($$\mathrm{H_2O}) $$has a higher boiling point than methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Water forms hydrogen bonds, which are stronger than the London dispersion forces present in methane.

Question 2

Which of the following is the correct electron configuration for a neutral nitrogen atom ($$Z=7$$)?

Accepted Answer

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

Question 3

Which of the following molecules is expected to have a net dipole moment?

Accepted Answer

$$\mathrm{CH_3Cl}$$

Question 4

What is the formal charge on the central atom in the nitrate ion ($$\mathrm{NO_3$^-}) $$when drawn with one double bond and two single bonds to oxygen?

Accepted Answer

Formal charge on N is $$+1$$

Question 5

Which of the following best describes the hybridization of the carbon atom in ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$sp$$

Question 6

Which of the following is a constitutional isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

2-methylpropane

Question 7

Which of the following statements about $$\pi$$ bonds is correct?

Accepted Answer

$$\pi$$ bonds are formed by the sideways overlap of unhybridized p orbitals.

Question 8

Which of the following compounds contains both a $$\pi$$ bond and a $$\sigma$$ bond?

Accepted Answer

Ethene ($$\mathrm{C_2H_4})$$

Question 9

Which of the following best explains why $$\mathrm{NH_3$} is $$soluble in water?

Accepted Answer

$$\mathrm{NH_3$}$$ can form hydrogen bonds with water molecules.

Question 10

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$?

Accepted Answer

3-methylpentane

Question 11

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They are present in all molecules, regardless of polarity.

Question 12

Which of the following best describes the effect of increasing chain length on the boiling point of alkanes?

Accepted Answer

Boiling point increases due to greater London dispersion forces.

Question 13

Which of the following is the correct condensed formula for 2,2-dimethylpropane?

Accepted Answer

$$\mathrm{(CH_3$)_4C}$$

Question 14

Which of the following best explains why $$\mathrm{CO_2$} is a $$nonpolar molecule despite having polar bonds?

Accepted Answer

The molecule is linear, so the bond dipoles cancel each other out.

Question 15

Which of the following is a correct statement about the difference between bonding and antibonding molecular orbitals?

Accepted Answer

Bonding MOs have lower energy than the original atomic orbitals, while antibonding MOs have higher energy.

Question 16

Which of the following is the correct order of increasing strength for the three main types of intermolecular forces?

Accepted Answer

London dispersion \u003c dipole-dipole \u003c hydrogen bonding

Question 17

Which of the following best describes the geometry and bond angle of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 18

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$?

Accepted Answer

pentane

Question 19

Which of the following statements about constitutional isomers is correct?

Accepted Answer

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

Question 20

A student is asked to draw the Lewis structure for $$\mathrm{CO_2$}. $$Which of the following is the correct number of valence electrons to use?

Accepted Answer

16

Organic Chemistry Fundamentals: Atomic Structure, Bonding, and Hydrocarbons

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