Alkanes
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
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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