Which of the following behaves as a Lewis aci | vedclass

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(B) Lewis acids are electron-deficient species that can accept an electron pair,while Lewis bases are electron-rich species that can donate an electro

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$BF_3$

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(B) Lewis acids are electron-deficient species that can accept an electron pair,while Lewis bases are electron-rich species that can donate an electron pair.$NMe_3$ (trimethylamine) and $PH_3$ (phosphine) have lone pairs on the central atom ($N$ and $P$ respectively),making them Lewis bases.$CO$ (carbon monoxide) also acts as a Lewis base due to the lone pair on the carbon atom.$BF_3$ (boron trifluoride) is a Lewis acid because the boron atom has an incomplete octet,possessing only $6$ electrons in its valence shell.

Which of the following behaves as a Lewis acid?

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