Which of the following is not a Lewis acid?

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Question

(A) Lewis acid is defined as an electron pair acceptor.$SiCl_4$ has vacant $d-$orbitals on the $Si$ atom,allowing it to accept electron pairs.$SO_3$ h

Vedclass · Accepted Answer

$CO$

Vedclass · Answer

(A) Lewis acid is defined as an electron pair acceptor.$SiCl_4$ has vacant $d-$orbitals on the $Si$ atom,allowing it to accept electron pairs.$SO_3$ has an electron-deficient $S$ atom due to the electronegative oxygen atoms.$Zn^{2+}$ is a metal cation that can accept electron pairs to form coordinate bonds.$CO$ (carbon monoxide) has a lone pair on the carbon atom,which it can donate,making it a Lewis base rather than a Lewis acid.Therefore,the correct answer is $A$.

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