MCQ
Order of stability of conjugate base of the given acid is
- ✓$ii > i > iii$
- B$i > ii > iii$
- C$iii > ii > i$
- D$iii > i > ii$
Conjugate base of compound II is least stable as it destroys the aromaticity of the compound. The carbon in $C H \equiv C^{-}$ is $sp$ hybrid and being electron negative it can hold the charge.
Therefore the order of stability of conjugate base is $III > I > II$ and hence the order of acidic strength is $II > I > III$.
Stronger the acid lower the value of $p K_{a}$. The order of $p K_{a}$ is $III < I < II.$
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