How will you convert ethanoic acid into benzene?

How will you convert benzoic acid into benzene ?

How will you convert benzoic acid into benzaldehyde ?

How will you convert benzoic acid to benzamide ?

How will you convert : (i) Benzoic acid to benzaldehyde (ii) Acetophenone to benzoic acid (iii) Ethanoic acid to 2-hydroxyethanoic acid ?