Question 1

Which of the following molecules would you expect to have the highest boiling point, and why?

Accepted Answer

Ethanol, because it can form hydrogen bonds due to its -OH group.

Question 2

A student is trying to dissolve table salt (NaCl) in different solvents. In which solvent will NaCl be most soluble, and what principle explains this?

Accepted Answer

Water, because both are polar and 'like dissolves like'.

Question 3

Which of the following functional groups is present in acetone?

Accepted Answer

Ketone

Question 4

A molecule contains the group R-COOH. Which of the following statements about this molecule is correct?

Accepted Answer

It contains a carboxylic acid functional group and can form hydrogen bonds.

Question 5

Which of the following best explains why larger alkanes have higher boiling points than smaller alkanes?

Accepted Answer

Larger alkanes have stronger London dispersion forces due to increased surface area.

Question 6

Which of the following molecules is most likely to be miscible with water?

Accepted Answer

Triethylamine

Question 7

A student is given a molecule with the formula R-COCl. Which functional group does this represent, and what is a key property?

Accepted Answer

Acyl chloride; it is highly reactive and can participate in nucleophilic acyl substitution.

Question 8

Which of the following statements correctly compares thiols (R-SH) and alcohols (R-OH)?

Accepted Answer

Alcohols are more polar than thiols and generally have higher boiling points.

Question 9

Which of the following best describes a secondary (2°) carbon atom?

Accepted Answer

A carbon attached to two other carbon atoms.

Question 10

A molecule contains both an -OH group and a -COOH group. Which of the following is true about its solubility and intermolecular forces?

Accepted Answer

It is likely to be highly soluble in water and can form multiple hydrogen bonds.

Question 11

Which of the following molecules would exhibit the strongest dipole-dipole interactions?

Accepted Answer

Acetone (CH3COCH3)

Question 12

A student is analyzing a molecule and identifies the group R-NH2. Which functional group is this, and what is a key property?

Accepted Answer

Amine; it can act as a base and form hydrogen bonds.

Question 13

Which of the following best explains why water has a much higher boiling point than hydrogen sulfide (H2S)?

Accepted Answer

Water forms extensive hydrogen bonds, while H2S does not.

Question 14

Which of the following is NOT a correct pairing of functional group and example?

Accepted Answer

Aldehyde – Acetone

Question 15

A molecule is found to be miscible with both water and ethanol but not with hexane. Which of the following is the most likely explanation?

Accepted Answer

The molecule is polar and can form hydrogen bonds.

Question 16

Which of the following statements about the carbonyl group (C=O) is correct?

Accepted Answer

It is a component of many functional groups but is not itself a functional group.

Question 17

Which of the following best describes the difference between an ether (R-O-R') and a sulfide (R-S-R')?

Accepted Answer

Ethers contain oxygen and are generally more polar than sulfides, which contain sulfur.

Question 18

A molecule contains a carbon atom attached to three other carbons and one hydrogen. What is the degree of this carbon and the hydrogen attached to it?

Accepted Answer

Tertiary (3°) carbon and tertiary (3°) hydrogen

Question 19

Which of the following best explains why branched alkanes have lower boiling points than their straight-chain isomers of similar molecular weight?

Accepted Answer

Branched alkanes have less surface area, resulting in weaker London dispersion forces.

Question 20

Which of the following functional groups is present in acetonitrile?

Accepted Answer

Nitrile

Intermolecular Forces, Solubility, and Functional Groups: Foundations for General Biology and Organic Chemistry

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