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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
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