Raréfier belong to the 1
st group.
Raréfier is conjugated the same way that verbs that end in :
-ier
Raréfier is conjugated with
auxiliary avoir.
Raréfier verb is direct transitive.
French verb raréfier can be conjugated in the reflexive form:
Raréfier verb is a direct transitive verb, so ive voice can be used.