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BITSAT 2015
Exam
BITSAT
Year
2015
Subject
Chemistry
Chapter
Ionic Equilibrium

BITSAT 2015 · Chemistry · Ionic Equilibrium

What is the correct increasing order of Bronsted bases?

What is the correct increasing order of Bronsted bases?

Options

  1. AClO4−<ClO3−<ClO2−<ClO−\mathrm{ClO}_{4}^{-}< \mathrm{ClO}_{3}^{-}< \mathrm{ClO}_{2}^{-}< \mathrm{ClO}^{-}
  2. BClO4−>ClO3−>ClO2−>ClO−\mathrm{ClO}_{4}^{-} > \mathrm{ClO}_{3}^{-} > \mathrm{ClO}_{2}^{-} > \mathrm{ClO}^{-}
  3. CClO3−<ClO4−<ClO2−<ClO−\mathrm{ClO}_{3}^{-}< \mathrm{ClO}_{4}^{-}< \mathrm{ClO}_{2}^{-}< \mathrm{ClO}^{-}
  4. DClO−>ClO3−>ClO2−<ClO4−\mathrm{ClO}^{-} > \mathrm{ClO}_{3}^{-} > \mathrm{ClO}_{2}^{-}< \mathrm{ClO}_{4}^{-}

Correct answer

A. ClO4−<ClO3−<ClO2−<ClO−\mathrm{ClO}_{4}^{-}< \mathrm{ClO}_{3}^{-}< \mathrm{ClO}_{2}^{-}< \mathrm{ClO}^{-}

Step-by-step solution

ClO4−<ClO3−<ClO2−<ClO−\mathrm{ClO}_{4}^{-}< \mathrm{ClO}_{3}^{-}< \mathrm{ClO}_{2}^{-}< \mathrm{ClO}^{-} is the correct increasing order of Bronsted base. With increase in the number of oxygen atoms in the conjugate bases, the delocalisation of the π\pi bond becomes more and more extended. This results in decrease in the electron density. Consequently basicity also decreases.
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