Which of the following is not a Lewis acid?

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Question

(D) Lewis acid is an electron pair acceptor,while a Lewis base is an electron pair donor.$BF_3$,$AlCl_3$,and $FeCl_3$ are electron-deficient compounds

Vedclass · Accepted Answer

$PH_3$

Vedclass · Answer

(D) Lewis acid is an electron pair acceptor,while a Lewis base is an electron pair donor.$BF_3$,$AlCl_3$,and $FeCl_3$ are electron-deficient compounds that can accept an electron pair,thus acting as Lewis acids.$PH_3$ contains a phosphorus atom with a lone pair of electrons,which it can donate,making it a Lewis base.Therefore,the correct answer is $D$.

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