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why is there no hydrogen bonding btw two CH3F molecules and aldehydes n plz any1 give a brief explanation y these 2 have permanent dipole interactions n not hydrogen bonding n in which cases wud hydrogen bonding occur??
There's no hydrogen bond between CH3F molecules because there is no H-F bond, F is bonded to C here, not H. Also, in aldehydes, there's no H-O bond, the O is bonded to C. I suggest you revise hydrogen bonding from the textbook.
Hydrogen bonding occurs between H that is bonded to F, O or N in one molecule, and F, O or N bonded to H in another molecule..
Examples:
NH3 can form hydrogen bonds with water.
N-H ---- O-H
HF can form hydrogen bonds with water as well.
H-F ---- O-H