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Acidic Nature vs Percentage S Characters

Among the fol...

Question

Among the following, the weakest conjugate base is :

H^{-}

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C H_{3}^{-}

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C H_{3} O^{-}

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C l^{-}

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Solution

The correct option is D $C l^{-}$
The stronger of a pair of acids form the weaker of a pair of conjugate bases. The fact that HCl is a stronger acid as compared to $C H_{3} O H, C H_{4}, a n d H_{2}$ implies that the $C l^{-}$ ion is a weaker conjugate base.
$C l^{-}$ is formed from $H C l$ which is the strongest acid and hence weakest conjugate base is $C l^{-}$

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Which is the strongest conjugate base? The options are, (CH3)3CO , (CH3)2CHO , CH3CH2O, CH3O

H C l + H_{2} O \to H_{3} O^{+} + C l^{-}

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H_{2} O

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