1. Which of the following physical properties is directly

related to the molecular structure of a substance?

a) Boiling point

b) Color

c) Mass

d) Volume

Answer: a) Boiling point

Rationale: Boiling point is determined by the

intermolecular forces between molecules, which are

influenced by the molecular structure.

2. How does an increase in the number of double bonds

affect the chemical properties of a hydrocarbon?

a) Increases solubility in water

b) Increases reactivity with oxygen

c) Decreases flammability

d) Decreases boiling point

Answer: b) Increases reactivity with oxygen

Rationale: Double bonds are more reactive than single

bonds, making the hydrocarbon more susceptible to

reactions with oxygen.

3. Which of the following structural features leads to the

highest boiling point in a series of compounds?

a) Long carbon chain