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Which of the following statements about Van der Waals forces are correct? (A) Van der Waals forces are responsible for the formation of molecular crystals. (B) Branching lowers the boiling points of isomeric organic compounds because of a decrease in Van der Waals forces. (C) In graphite, Van der Waals forces act between the carbon layers. (D) In diamond, Van der Waals forces act between the carbon layers.

1. (A)
2. (B)
3. (C)
4. (D)

Correct answer: (A)

Solution

A: Molecular crystals (e.g., solid CO2, I2) are held by Van der Waals forces - TRUE. B: Branching reduces surface area, weakening London dispersion forces, lowering boiling point - TRUE. C: Graphite layers are held together by Van der Waals (London dispersion) forces - TRUE. D: Diamond has a 3D sp3 covalent network with no layers - FALSE. Statements A, B, and C are correct; D is false.

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