Problem: The substances below have molar masses that are the same within 2 g/mol. Which substance has the lowest boiling point?A. Need to know concentration in order to determine change in boiling and thus boiling point.B. CH3CH2CH3 C. CH3CH2OHD. CH3CHOE. CH3OCH3

FREE Expert Solution

We’re being asked to identify the compound with the lowest boiling point among the given choices.


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 weak intermolecular forces have low boiling points. This is because they require less energy to be able to break the bonds during the phase transition.


So, we need to identify which among the given compounds has the weakest intermolecular forces

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Problem Details

The substances below have molar masses that are the same within 2 g/mol. Which substance has the lowest boiling point?

A. Need to know concentration in order to determine change in boiling and thus boiling point.

B. CH3CH2CH3 

C. CH3CH2OH

D. CH3CHO

E. CH3OCH3