Which of the following is not a Lewis acid?

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Question

(D) Lewis acid is an electron pair acceptor. $BF_3$ and $AlCl_3$ are electron-deficient compounds and act as Lewis acids. $HCl$ can act as a Lewis aci

Vedclass · Accepted Answer

$LiAlH_4$

Vedclass · Answer

(D) Lewis acid is an electron pair acceptor. $BF_3$ and $AlCl_3$ are electron-deficient compounds and act as Lewis acids. $HCl$ can act as a Lewis acid due to the presence of an empty orbital on the hydrogen atom or by accepting electron pairs. $LiAlH_4$ contains the $AlH_4^-$ ion,which can donate a hydride ion $(H^-)$,acting as a nucleophile or Lewis base. Therefore,$LiAlH_4$ is not a Lewis acid.

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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