AP EAMCET Engineering 2018 Apr 23 Shift 2 Paper

As we know that the electron releasing groups decreases the strength of acids and electron withdrawing groups increases the strength of acids.
Nitro group (−NO2) is an electron withdrawing group.
Methoxy (−OCH3) is an electron releasing group.
Acetic acid (CH3‌COOH) is an electron releasing group.
Therefore, the correct order is:
IV > I > II > III