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What are Lewis acids and bases? Give two...

What are Lewis acids and bases? Give two example for each.

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Lewis acid - A Lewis is a positive ion (or) an electron deficient molecule which accepts an electron pair.
Eg: `BF_3, AICI_3,BeF_2.`
Lewis Base - A Lewis base is a anion (or) neutral molecule with at least one lone pair of electrons that can donate an electron pair.
Eg : `NH_3, R-NH_2,F^-,CI^- .`
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