Which of the following is not a Lewis acid?

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(D) Lewis acid is defined as an electron pair acceptor. $BF_3$ has an incomplete octet on the boron atom,making it an electron-deficient species and a

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$C_2H_4$

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(D) Lewis acid is defined as an electron pair acceptor. $BF_3$ has an incomplete octet on the boron atom,making it an electron-deficient species and a Lewis acid. $FeCl_3$ has an empty $d$-orbital and an incomplete octet,acting as a Lewis acid. $SiF_4$ has vacant $d$-orbitals on the silicon atom,allowing it to accept electron pairs,thus acting as a Lewis acid. $C_2H_4$ (ethene) has a $\pi$-bond but does not have an empty orbital to accept an electron pair in the standard sense of a Lewis acid. Therefore,$C_2H_4$ is not a Lewis acid.

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