What is Z in the above sequence of reactions?

Step-by-step solution

Cumene on oxidation followed by acidic hydrolysis yields phenol (X). Reaction of phenol with carbon dioxide in the presence of sodium hydroxide, followed by acidification converts phenol to 1 −hydroxybenzoic acid (Salicylic acid) (Y).This is Kolbe–Schmitt reaction. The salicylic acid then reacts with acetic anhydride ( ( CH 3 CO ) 2 O ) to form aspirin (Z).