Among the following,the weakest Lewis base is

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(C) Lewis base is a species that can donate a lone pair of electrons.According to the Bronsted-Lowry theory,the conjugate base of a strong acid is a w

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$Cl^-$

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(C) Lewis base is a species that can donate a lone pair of electrons.According to the Bronsted-Lowry theory,the conjugate base of a strong acid is a weak base.Among the given options,$HCl$ is a strong acid,so its conjugate base $Cl^-$ is the weakest base.$H^-$ is the conjugate base of $H_2$,$OH^-$ is the conjugate base of $H_2O$,and $HCO_3^-$ is the conjugate base of $H_2CO_3$.Since $HCl$ is the strongest acid among the corresponding conjugate acids,$Cl^-$ is the weakest base.

List-$I$ (Acid)	List-$II$ $(K_a)$
$A$. Phenol	$I$. $1 \times 10^{-13}$
$B$. Benzoic acid	$II$. $3.0 \times 10^{-8}$
$C$. $HClO$	$III$. $1.0 \times 10^{-10}$
$D$. $CH_3COOH$	$IV$. $6.5 \times 10^{-5}$
	$V$. $1.75 \times 10^{-5}$

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