Chemistry - GOC Question with Solution | TestHub

$\mathrm{c}>\mathrm{a}>\mathrm{b}>\mathrm{d}$

orthonitrophenol is less acidic than para, due to intramolecular hydrogen bonding in ortho isomer b is less than a & c because ($-\mathrm{R}$) of –${\mathrm{NO}}_2$ do not operates from meta position

d is least acidic absence of electron withdrawing group.