Chlorobenzene is nitrated with $HNO X_{3}$ / $H X_{2} SO X_{4}$ and the major (para) product is separated, heated with aqueous $NaOH$ at 433 K and finally acidified. The product is

Answer: D

Nitration gives mainly 1-chloro-4-nitrobenzene. The para

NO X_{2}

activates

Cl

for SNAr, so

OH X^{-}

displaces

Cl

to give sodium 4-nitrophenoxide; acidification gives 4-nitrophenol. The

NO X_{2}

group is not removed.