At STP, which of the following substances has the strongest hydrogen bonds between their molecules?
A) CH3COOH
B) CH3CH2CHO
C) CH3F
D) (CH3)3N
E) H2S
Hi!
i thought it was C) but the answer is A), as F-H is stronger than O-H
is this because TWO O will create a stronger dipole moment than ONE F?
Hi!
The reason option A is correct as we know that it forms H bondings.
While in CH3F permanent dipole is present and also it’s polar but in this case H bonding doesn’t occur, since the F atom is bonded to the central C atom (F must be bonded to H in order for hydrogen bonding to occur).
Hope this helps:)
Hey! I totally understand you, F-H is indeed the strongest hydrogen bond. Nevertheless, the option 3) is not showing an H bond: if you draw the structure, the F is connected to the C, so in reality it’s just a permanent dipole-dipole. Hope it’s clear!