# Ordering compounds by boiling points

Here is a MC question from my chemistry professor:

What is the correct order of boiling points for molecules: $\ce{CO2}$, $\ce{LiOH}$, $\ce{CH3OH}$, $\ce{CH2O}$?

I am mainly confused about ordering compounds by boiling points by using dipole-dipole attraction/H-bonding (I did not consider using London dispersion forces because there were Os and Hs involved - do not know if I did the right thing).

How do I find out the dipole moment for polyatomic ions, especially complicated ones like the $\ce{CH3OH}$?

• These are like simplest organic molecules... – Mithoron Aug 23 '17 at 22:27
• This is more or less duplicate of chemistry.stackexchange.com/questions/15091/… – Mithoron Aug 23 '17 at 22:29
• $\ce{CH3OH}$ is methanol. It is a molecular organic compound and not a polyatomic ion. – Zhe Aug 24 '17 at 0:09
• From the homework close reason: ‘should demonstrate understanding of the underlying concepts’. This is the case here as your question demonstrates non-understanding of a fundamental underlying concept. – Jan Sep 23 '17 at 4:38