The correct increasing order of the acid strength of benzoic acid (I),4-nitrobenzoic acid (II),3,4-dinitrobenzoic acid (III) and 4-methoxybenzoic acid (IV) is

Options

A. `I lt II lt III lt IV `
B. `II lt I lt IV lt III `
C. `IV lt I lt II lt III `
D. `IV lt II lt I lt III `

Answer

C

Explanation

Electron withdrawing group `(-NO_2)` present in benzoic acid increase the acidic stength while electron releasing group `(-OCH_3)` decreases the acidic strength .hence correct order of acidic strength is ` IV lt I lt II lt III`