Which of the following can be classified as autoprotolysis reactions?

H_{2} O (l) + H_{2} O (l) ⇌ H_{3} O^{+} (a q) + O H^{-} (a q)

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2 N H_{3} (l) ⇌ N H_{4}^{+} (a q) + N H_{2}^{-} (a q)

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C H_{3} C O O H (a q) ⇌ C H_{3} C O O^{-} (a q) + H^{+} (a q)

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2 C H_{3} C O O H (l) ⇌ C H_{3} C O O^{-} (a q) + C H_{3} C O O H_{2}^{+} (a q)

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Solution

The correct options are
A $H_{2} O (l) + H_{2} O (l) ⇌ H_{3} O^{+} (a q) + O H^{-} (a q)$
B $2 N H_{3} (l) ⇌ N H_{4}^{+} (a q) + N H_{2}^{-} (a q)$
D $2 C H_{3} C O O H (l) ⇌ C H_{3} C O O^{-} (a q) + C H_{3} C O O H_{2}^{+} (a q)$
Self ionization or auto - protolysis :
The phenomenon in which Proton transfer is occurring between two identical molecules is known as self ionization.
For example - $H_{2} O B r o n s t e d A c i d (l) + H_{2} O B r o n s t e d B a s e (l) ⇌ H_{3} O^{+} C o n j u g a t e A c i d (a q) + O H^{-} (a q C o n j u g a t e B a s e)$

In the above example , $H_{2} O$ acts both as a Bronsted base and a Bronsted acid and consequently conjugate acid $H_{3} O^{+}$ and conjugate base $O H^{-}$ are formed.

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