For straight-chain alkenes, the addition of each successive group to the homologous series typically increases the boiling point by a certain range. If the lower bound of this expected boiling point i

Question

For straight-chain alkenes, the addition of each successive $-CH_2-$ group to the homologous series typically increases the boiling point by a certain range. If the lower bound of this expected boiling point increase per $-CH_2-$ group is $X$ Kelvin, what is the exact value of $X$?

Prashant Kotian · Accepted Answer

Correct answer: 20. As the molecular mass and surface area increase with each added group, the van der Waals dispersion forces become stronger. This regular increase raises the boiling point of the homologous series by to Kelvin per unit. Thus, the lower bound is 20 K.

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