Which one of the following series contain electrophiles only?
H2O, SO3, H3O+
NH3, H2O, AlCl3
AlCl3, SO3NO2+
H2O, Cl+, NH3
Electrophiles are electron liking or seeking species which are electron deficient.
The order of boiling point of NH3, H2O, HF and PH3 is