Question 1

Which of the following best describes constitutional isomers?

Accepted Answer

Molecules with the same molecular formula but different connectivity of atoms.

Question 2

Which of the following statements about enantiomers is correct?

Accepted Answer

They are non-superimposable mirror images and are chiral.

Question 3

Which of the following molecules is most likely to exhibit hydrogen bonding?

Accepted Answer

NH$$_3$$

Question 4

What is the main factor that determines the strength of London dispersion forces between molecules?

Accepted Answer

The number of electrons in the molecule (polarizability).

Question 5

Which of the following best explains why n-nonane (C$$_9H$_{20}) $$has a higher boiling point than n-pentane (C$$_5H$_{12}$$)?

Accepted Answer

n-Nonane has more electrons, leading to stronger London dispersion forces.

Question 6

Which of the following is a requirement for a molecule to be chiral?

Accepted Answer

It must have an sp$$^3$$ hybridized carbon attached to four different groups.

Question 7

Which intermolecular force is present in all molecules, regardless of their polarity?

Accepted Answer

London dispersion forces

Question 8

A molecule has a dipole moment of 1.85 D. What does this indicate about the molecule?

Accepted Answer

The molecule has a net separation of charge due to an unbalanced 3D arrangement of polar bonds.

Question 9

Which of the following best describes the interaction between two water molecules?

Accepted Answer

Hydrogen bonding, dipole-dipole, and London dispersion forces

Question 10

Which of the following is NOT a requirement for hydrogen bonding between two molecules?

Accepted Answer

A hydrogen atom bonded to a carbon atom

Question 11

Which of the following statements about geometric isomers is correct?

Accepted Answer

They differ in the arrangement of groups around a non-rotating bond.

Question 12

Which of the following molecules would have the highest boiling point, assuming similar molar masses?

Accepted Answer

A molecule capable of hydrogen bonding

Question 13

Which of the following best explains why methamphetamine and levo-methamphetamine have different biological effects?

Accepted Answer

They are enantiomers, which interact differently with chiral biological molecules.

Question 14

Which of the following is true about the boiling points of molecules with similar numbers of electrons but different dipole moments?

Accepted Answer

The molecule with the largest dipole moment will generally have the highest boiling point.

Question 15

Which of the following best describes a diastereomer?

Accepted Answer

A non-superimposable, non-mirror image stereoisomer

Question 16

Which of the following is a real-world consequence of the existence of enantiomers?

Accepted Answer

One enantiomer of a drug can be therapeutic while the other can be harmful, as seen with thalidomide.

Question 17

Which of the following molecules would you expect to have the weakest intermolecular forces?

Accepted Answer

A small, nonpolar molecule

Question 18

Which of the following best describes the effect of branching on the strength of London dispersion forces?

Accepted Answer

Branching decreases the strength of London dispersion forces because molecules cannot get as close.

Question 19

Which of the following is the correct formula for calculating the dipole moment ($$\mu) of a $$molecule?

Accepted Answer

$$\mu = q 	imes r$$

Question 20

Which of the following statements about intermolecular forces is correct?

Accepted Answer

London dispersion forces are present in all molecules, but are the only force in nonpolar molecules.

Isomerism and Intermolecular Forces in General Chemistry

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