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  4. Which of the following behaves as Lewis acid and not as Bronsted acid ?

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Q. Which of the following behaves as Lewis acid and not as Bronsted acid ?

UPSEEUPSEE 2009

Solution:

Lewis acids have a tendency to accept electrons while Bronsted acids have a tendency to donate proton.

(a) $\underset {\text{Bronsted acid}}{HCl} \longrightarrow H ^{+}+ Cl ^{-}$

(b) $\underset{\text{Bronsted acid}}{H _{2} SO _{4}} \longrightarrow H ^{+}+ HSO _{4}^{-}$

(c) $\underset{\text{Bronsted acid }}{HSO _{3}^{-}} \longrightarrow H ^{+}+ SO _{3}^{2-}$

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