Which of the following is not a Lewis acid?

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Question

(D) Lewis acid is defined as an electron pair acceptor.$SiF_4$ has an empty $d$-orbital on the $Si$ atom,allowing it to accept electron pairs.$FeCl_3$

Vedclass · Accepted Answer

$C_2H_4$

Vedclass · Answer

(D) Lewis acid is defined as an electron pair acceptor.$SiF_4$ has an empty $d$-orbital on the $Si$ atom,allowing it to accept electron pairs.$FeCl_3$ has an incomplete octet on the $Fe$ atom,making it an electron pair acceptor.$BF_3$ has an incomplete octet on the $B$ atom (only $6$ electrons),making it a classic Lewis acid.$C_2H_4$ (ethene) has a $\pi$-bond and acts as a Lewis base because it can donate electron density from its double bond,not as a Lewis acid.

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