Why does a branched alkane have a lower boiling point than a normal alkane of th

Question

Why does a branched alkane have a lower boiling point than a normal alkane of the same molar mass? Why do the strengths of London dispersion forces increase with increasing molecular size? Select the compound in each of the following pairs whose molecules experience stronger London dispersion forces, CCl_4 or CF_4; CH_4 or C_3H_8; CS_2 or CO_2 The three most abundant gases in air are N_2, O_2, and Ar. Which of them has the highest boiling point, and which has the lowest boiling point? Fuels from Crude Oil Petroleum (crude oil) is a complex mixture of mostly hydrocarbons that can be separated into useful fuels by distillation. Common petroleum-based fuels in order of increasing boiling point are gasoline, jet fuel, kerosene, fuel oil, and diesel oil. Which of the fuels contains hydrocarbons with the highest average molar mass? Which of the fuels in Problem 6.15 is the most viscous at 20^degree C?

Explanation / Answer

Dispersion forces tend to increase with increasing molecular weight,

Among CF4 and CCl4 ; CCl4 has a much greater molecular weight, hence greater dispersion forces.

Similarly

C3H8 and CS2 has greater london dispersion forces

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