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boiling point between alkanes and alcohol

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Question:Why do the differences in boiling points between alcohols and alkanes get less as the number of carbon atoms in a chain increases?? Alcohols have a higher boiling point due to their O-H group but why does the difference not just stay the same as each gains a carbon atom? Thanks

Answers:As the number of carbon atoms decreases, so does the energy required to break those bonds and make the substance boil. For similar molecular weights, alcohols will always have higher boiling points than alkanes due to the intermolecular hydrogen bonding made possible by the alcohol's OH group

Question:Particularly the groups of ethane, propane, butane and pentane versus methanol, ethanol, 1-propanol and 1-butanol. Any help with a brief explanation would be EXTREMELY welcome!

Answers:The boiling point of the 2 groups will depend on the intermolecular forces between the molecules. In alkanes, there are no polar groups, so the intermolecular force is dispersion/ Vaan der Waal's/ London forces. In alcohols, all molecules have -OH groups, and so the intermolecular forces are hydrogen bonds. Hydrogen bonds are stronger than dispersion forces. More energy is needed to over the stronger hydrogen bonds and make alcohols gaseous, so alchohols have higher boiling points. Hope that helped.


Answers:alcohol have high boiling point compared to other two because of the presence of hydrogen bonding. Ethers have compartively little higher boiling point than alkanes due to dipole dipole interaction possible between them Alkanes, neither have hydrogen bonding nor do they can form dipoles so they have least boiling point.

Question:Explain the difference in boiling points between alkanes and alkenes of the same number of carbon atoms

Answers:In organic compounds has carbon 4 links everytime - fact. When you compound with more carbon atoms - 3 to "infinity" may not be associated only one bond. But maybe two or even three. Propane has three carbons associated with a single bond - C3H8. Propene has between two atoms of carbon double bond - C3H6. A triple propin - C3H4.