MHT CET 2024 Chemistry question

Which from following has highest boiling point?

(A)2 methoxy propane
(B)n-butane
(C)2-methylbutane
(D)n-pentaneCorrect

Answer: (D)

Solution

Boiling point increases with molecular mass and with surface area (stronger van der Waals forces); branching lowers it. n-Pentane (bp 309 K) is a straight-chain C5 alkane; its branched isomer 2-methylbutane (bp 301 K) has a smaller surface area and boils lower;

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Question ID VK-092947