Problem: What type of intermolecular force accounts for the following differences in each case?CH3OH boils at 65 °C, CH3SH boils at 6 °Ca. London dispersion forces.b. Dipole-dipole bonding.c. Hydrogen bonding.d. Ion-dipole bonding.

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Recall that there are several types of intermolecular forces (IMF):

1. Ion-dipole interaction – occurs between an ion and a polar covalent compound; strongest IMF

2. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F; 2nd strongest IMF

3. Dipole-dipole interaction – occurs between two polar covalent compounds; 3rd strongest IMF

4. Dispersion forces – occurs in all compounds and is the primary IMF exhibited by nonpolar compounds; weakest IMF


Compounds with strong intermolecular forces have high boiling points. This is because they require more energy to be able to break the bonds during the phase transition.


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Problem Details

What type of intermolecular force accounts for the following differences in each case?
CH3OH boils at 65 °C, CH3SH boils at 6 °C
a. London dispersion forces.
b. Dipole-dipole bonding.
c. Hydrogen bonding.
d. Ion-dipole bonding.

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