MHT CET 2026 Chemistry question

Which of the following hydrocarbons has stronger London dispersion forces?

(A)Methane
(B)Ethane
(C)n-pentaneCorrect
(D)neo-pentane

Answer: (C)

Solution

London (dispersion) forces arise from instantaneous induced dipoles, and their strength increases with the number of electrons (molecular mass) and the surface area of contact between molecules. Methane and ethane are small molecules with few electrons and hence the weakest dispersion forces. n-Pentane and

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Question ID VK-100873