Which of the following is a Lewis acid?

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Question

(D) Lewis acid is defined as an electron-pair acceptor.$PH_3$ and $NF_3$ have a lone pair on the central atom,making them Lewis bases.$NaH$ is an ioni

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$B(CH_3)_3$

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(D) Lewis acid is defined as an electron-pair acceptor.$PH_3$ and $NF_3$ have a lone pair on the central atom,making them Lewis bases.$NaH$ is an ionic hydride containing the hydride ion $(H^-)$,which acts as a Lewis base.In $B(CH_3)_3$,the central Boron atom has only $6$ valence electrons (an incomplete octet),as shown in the structure. Therefore,it can accept an electron pair to complete its octet,making it a Lewis acid.

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