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Alkanes

Easychemistry

Which of the following alkanes exhibits the highest boiling point?

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About This Question

Subject
chemistry
Chapter
hydrocarbons
Topic
alkanes
Difficulty
Easy
Year
2025
Tags
AlkanesBoiling PointVan der Waals ForcesBranching

Solution

Correct Answer:

n-Pentane

Boiling point of alkanes increases with molecular mass and surface area available for van der Waals interactions. n-Pentane (C₅H₁₂, bp 36 °C) has the highest molecular mass among the options AND is unbranched, maximising the contact surface area for London dispersion forces. n-Butane and isobutane are both C₄ isomers with lower molecular mass. Neopentane is a C₅ isomer but its highly compact spherical shape minimises surface contact, giving it the lowest bp (9.5 °C) among C₅ isomers. Therefore n-Pentane has the highest boiling point of the given choices.

This easy difficulty chemistry question is from the chapter hydrocarbons, covering the topic of alkanes. It appeared in the 2025 exam.

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