Methanol cannot be dried with anhydrous CaCl2 because
CaCl2 dissolves in it
it is not good dehydrating agent
It forms as solid CaCl2 · 4CH3OH
it reacts with CH3OH
The correct order of ease of dehydration of following is:
I > II > III
III > II > I
I > III > II
III > I > II
The compound that is most difficult to protonate is :
C.
Due to involvement of lone pair of electrons in resonance in phenol, it will have positive charge (partial), hence incoming proton will not be able to attack easily.