que faire vs quoi faire?

Question

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

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 !