French language Q&A Forum

When ı had a look at the irregular adverbs forms I saw that the irregular form of "le plus mal" was "le pire"
isn't it incorrect? Because when I investigated it I saw that it must be "Le pis"

C'est lui qui danse le plus mal   He's the one who dances the worst. (I think this is correct)
C'est lui qui danse le pis   He's the one who dances the worst. (I think this is correct)

C'est lui qui danse le pire  He's the one who dances the worst. (I think this must be incorrect)

Am I wrong? 
please help

Hi, why does “the que before the penser” (b) & (c) become “a quoi after the penser” (a)?

(a) “Et vous, vous pensez QUOI des selfies ?”

(b) “Et vous, QUE pensez-vous des selfies ?”

(c) “Et vous, QU'est-ce que vous pensez des selfies ?”