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Stability of Carbanion

The dec...

Question

The decreasing order of $p K_{a}$ value of the following is:
I. $C H \equiv C H$
II.
III.

A

I I I > I > I I

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B

I I > I > I I I

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C

I I I > I I > I

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D

I > I I \equiv I I I

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Solution

The correct option is B $I I > I > I I I$
The decreasing order of $p K_{a}$ value: II > I > III

Conjugate base stability order is as of follow:
The more stable is the conjugate base, the stronger is the acidic strength. (lower $p K_{a}$ ). So, the correct order will be $I I > I > I I I$

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Stability of Carbanion

Standard XIII Chemistry

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