1. HClO₃ < HClO₄ < HClO₂ < HClO 2. HClO < HClO₂ < HClO₃ < HClO₄ 3. HClO₂ < HClO < HClO₃ < HClO₄ 4. HClO₄ < HClO₂ < HClO < HClO₃

Topic: General trends, Group 17 and 18· p-Block Elements

Among the following, the correct order of acidity is :

1. \(HClO_3 < HClO_4 < HClO_2 < HClO\)

2. \(HClO < HClO_2 < HClO_3 < HClO_4\)

3. \(HClO_2 < HClO < HClO_3 < HClO_4\)

4. \(HClO_4 < HClO_2 < HClO < HClO_3\)

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 neet Save WhatsApp Report

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Answer: 2. \(HClO < HClO_2 < HClO_3 < HClO_4\)

Key idea: in oxoacids of the same halogen, acidity rises with the number of oxygen atoms (higher oxidation state), because the conjugate base is stabilised by more resonance and a stronger inductive pull.

Oxidation state of Cl: HClO (+1), \(\mathrm{HClO_2}\) (+3), \(\mathrm{HClO_3}\) (+5), \(\mathrm{HClO_4}\) (+7).

So acidity: \(\mathrm{HClO<HClO_2<HClO_3<HClO_4}\), which is option 2. The other options break this order.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Among the following, the correct order of acidity is :

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