que faire vs quoi faire?

Question

What is the difference beteen Quoi faire and Que faire?  Is "que faire" ever correct?

Céline Pickard · Accepted Answer

Bonjour Lynn,
"Que faire" is considered more formal than "quoi faire":
Que faire en cas de tremblements de terre ? = What to do during an earthquake?
Attention : Using "Quoi (+ [infinitive verb]) ?" as an interrogative pronoun is rather colloquial in metropolitan French. I personally do not recommend this structure (although it seems to be used a lot in Canadian French).
You can use both in a sentence as a relative pronoun:

Je ne sais que faire = I don't know what to do
Je ne sais pas quoi faire = I don't know what to do

I hope this is helpful.
Bonne journée !