Which of the following statements is not correct?

(a) Replacement of —OH by a halogen in an alcohol is nucleophilic substitution reaction. It is the protonated alcohol which acts as a substrate. 

(b) Alcohols are acidic enough to react with active metals to liberate hydrogen gas. They are basic enough to accept a proton from strong acids. 

(c) It gives a ketone containing the same number of carbon atoms. Further oxidation will give carboxylic acid containing lesser number of carbon atoms.