Which of the following compounds CANNOT act a | vedclass

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(B) Lewis base is a chemical species that has the capability to donate an electron pair.In $NF_{3}$,the central atom $N$ has one lone pair.In $SF_{4}$

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$PCl_{5}$

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(B) Lewis base is a chemical species that has the capability to donate an electron pair.In $NF_{3}$,the central atom $N$ has one lone pair.In $SF_{4}$,the central atom $S$ has one lone pair.In $ClF_{3}$,the central atom $Cl$ has two lone pairs.Therefore,$NF_{3}$,$SF_{4}$,and $ClF_{3}$ can act as Lewis bases.In $PCl_{5}$,the central atom $P$ is in its maximum oxidation state $(+5)$ and has no lone pairs available for donation. Thus,it cannot act as a Lewis base.

Which of the following compounds $CANNOT$ act as a Lewis base?

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