What is the final product [Z] formed when the given reactions take place?

Step-by-step solution

The reaction of phenol with Zn dust under heating conditions leads to the reduction of phenol to benzene. Thus, [X] is benzene ( C₆H₆ ). The reaction of benzene with a mixture of concentrated HNO₃ and concentrated H₂SO₄ (nitrating mixture) results in electrophilic aromatic substitution, specifically nitration, to form nitrobenzene. Thus, [Y] is nitrobenzene ( C₆H₅NO₂ ). The reaction of nitrobenzene with Br₂ in the presence of FeBr₃ is an electrophilic aromatic substitution. The nitro group ( -NO₂ ) is a strongly de