All the following molecules can associate through intermolecular hydrogen bonding except

Essential condition for a molecule to involve in hydrogen bonding is that a covalently bonded hydrogen atom must be bonded to F (or) O (or) N.

$\because \mathrm{F}, \mathrm{O},\mathrm{N}$ are small in size and more electronegative atoms.

In ${\mathrm{CH}}_3\mathrm{F}$, fluorine atom is bonded to carbon atom but not hydrogen atom.