Question

which is more acidic?
phenol or methanol

Answer 1

C6H5OH vs CH3OH 
if you have the Ka or pKa values,
you can tell by that
Ka phenol = 1.3x10^-10 
Ka MeOH = 3.2x10^-16 
phenol will be the stronger acid 

Answer 2

phenol is more acidic than methanol.