MixedMediumQuestion 820012
Question
Amines have lower boiling points than alcohols of similar molecular weight because:
- AN−H···N hydrogen bonds are weaker than O−H···O hydrogen bondsCorrect
- BAmines are gases
- CAmines have lower molecular weight
- DN is less electronegative than O
Correct answer
N−H···N hydrogen bonds are weaker than O−H···O hydrogen bonds
Explanation
N is less electronegative than O. So N−H hydrogen bonds are weaker than O−H hydrogen bonds. Primary and secondary amines hydrogen bond, but the interactions are weaker than in alcohols → lower boiling points than alcohols of similar molecular mass.