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Old Sep 8th 2017, 09:43 AM   #1
shenno
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boiling points

why do the boiling points of aldehydes and alcohols increase with the number of carbon atoms.

i understand that the boiling points of alkanes increase with the number of carbon atoms through increasing van der vaal forces but with alcohols and aldehydes the intermolecular forces are hydrogen bonding and dipole-dipole. the strength of these are not affected by the number of carbon atoms
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Old Sep 23rd 2017, 06:19 AM   #2
chemtopper
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As you increase the number of carbons ...molar mass increases and hence london dispersion forces(LDFs) also increases.
And there is no change in dipole -dipole and H -bonding strength ,so what happens to total IMF in higher alcohols and aldehydes ?
It increases because of increase in LDFs as dipole -dipole and H bonding strength is not changing.Compare total IMF = LDFs+ H-Bonding +dipole-dipole
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