Mark the correct order of decreasing acid strength of the fo... | Chemistry - Acidity of Organic Compounds (Structural Effects on Acidity) | SolveeIt | Solveeit

Today, August 19

Question

Mark the correct order of decreasing acid strength of the following compounds.

(I) (II) (III) (IV) (V)

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A

V > IV > II > I > III

B

II > IV > I > III > V

C

IV > V > III > II > I

D

V > IV > III > II > I

Answer

II > IV > I > III > V

Explanation

Solution

– Nitro group (–NO₂) strongly withdraws electrons so nitrophenols [(II) and (IV)] are most acidic (with the p‐nitro isomer (II) being slightly stronger). – Phenol (I) is next. – In (V) the electron‑donating –OCH₃ group reduces acidity. – In (III) the –CH₂OH is aliphatic (pKₐ ~16) making it very weakly acidic.