Comparing Boiling Points of Methanal & Ethanal

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Why is there a difference in boiling points between methanal (CH2O) which is -21degrees Celsius and ethanal (CH3CHO) which is +21degrees Celsius?
 

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iluvchem09 said:
Why is there a difference in boiling points between methanal (CH2O) which is -21degrees Celsius and ethanal (CH3CHO) which is +21degrees Celsius?
I would expect the difference molecular mass has something to do with it.
 
I was researching it, and came up with mass, hydrogen bond with oxygen, and electrostatic attraction between molecules. What do you think would be the #1 reason?
 
Hydrogen bonding. It's by far the strongest of the mentioned effects.

Also, ethanal forms a more stable enolate.
 

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