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Q. Which is Lewis acid?

ManipalManipal 2010Equilibrium

Solution:

Electron acceptors are Lewis acids. They are electron deficient compounds. $BF _{3}$ is Lewis acid because $B$ has only 6 electrons in its valence shell and it can accept electrons. $NF _{3}, Cl ^{-}$ and $H _{2} O$ have lone pair of electrons. Thus, they are electron donors and Lewis bases.