Ammonia and hydrogen fluoride both have unusually high boiling points due to
a. dispersion forces
b. dipole-dipole interactions
c. hydrogen bonding
d. ion-dipole interactions
e. low molar masses

C. hydrogen bonding

Explanation:

Ammonia and hydrogen fluoride are both able to exhibit hydrogen bonding due to containing nitrogen (in ammonia) and fluoride (obviously in hydrogen fluoride). Remember the unique qualities of NOF. :)

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