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Question

Chemistry Question on Acids and Bases

What is the correct increasing order of Bronsted bases?

A

ClO4−<ClO3−<ClO2−<ClO−ClO _{4}^{-}< ClO _{3}^{-}< ClO _{2}^{-}< ClO ^{-}

B

ClO4−>ClO3−>ClO2−>ClO−ClO _{4}^{-}> ClO _{3}^{-}> ClO _{2}^{-}> ClO ^{-}

C

ClO3−<ClO4−<ClO2−<ClO−ClO _{3}^{-}< ClO _{4}^{-}< ClO _{2}^{-}< ClO ^{-}

D

ClO−>ClO3−>ClO2−>ClO4−ClO ^{-}> ClO _{3}^{-}> ClO _{2}^{-}> ClO _{4}^{-}

Answer

ClO4−<ClO3−<ClO2−<ClO−ClO _{4}^{-}< ClO _{3}^{-}< ClO _{2}^{-}< ClO ^{-}

Explanation

Solution

ClO4−<ClO3−<ClO2−<ClO−ClO _{4}^{-}< ClO _{3}^{-}< ClO _{2}^{-}< 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 p bond becomes more and more extended. This results in decrease in the electron density. Consequently basicity also decreases.