Apentix/AP Chemistry/Unit 3: Intermolecular Forces and Properties/Question

AP Chemistryeasymcq1 pt

Which has the strongest intermolecular forces: CH₄ or C₃H₈?

A.C₃H₈, because it is larger and more polarizable

B.CH₄, because it is more compact

C.They are equal because both are nonpolar

D.CH₄, because it is more electronegative

Explanation

Core Concept

Both are nonpolar, so dispersion forces dominate. Propane's bigger electron cloud polarizes more easily, making its temporary dipoles stronger — hence the higher boiling point.

Correct Answer

AC₃H₈, because it is larger and more polarizable

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