Problem: Melting and boiling points for benzene, toluene, and phenol.In which substance, benzene or toluene, are the intermolecular forces stronger?

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We are being asked which compound has a higher intermolecular force.


Boiling Point

▪ the temperature at which a liquid change into vapor
influenced by intermolecular forces between molecules


Intermolecular Forces (IMF) are the attractive forces between 2 molecules.

Ion-dipole

strongest IMF
▪ deals with the attraction between an ion and a polar compound.

 Hydrogen Bonding

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Problem Details

Benzene is a six carbon ring with alternating double bonds in the sides, each carbon bonded to a single hydrogen.  Benzene has a melting point of 5 degrees celsius and a boiling point of 80 degrees celsius. Toluene is a benzene ring with a methyl group, CH3, attached to one of the carbons instead of a hydrogen.  Toluene has a melting point of -95 degrees celsius and a boiling point of 111 degrees celsius. Phenol is a benzene ring with a hydroxy group, OH, attached to one of the carbons instead of a hydrogen.  Phenol has a melting point of 43 degrees celsius and a boiling point of 182 degrees celsius.
Melting and boiling points for benzene, toluene, and phenol.

In which substance, benzene or toluene, are the intermolecular forces stronger?

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Our tutors have indicated that to solve this problem you will need to apply the Intermolecular Forces and Physical Properties concept. If you need more Intermolecular Forces and Physical Properties practice, you can also practice Intermolecular Forces and Physical Properties practice problems.

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