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11.3     Why does boron triflouride behave as a Lewis acid ?

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The electronic configuration of boron is ns^2, np^1. It has three valance shell electrons. It can form only three covalent bonds. It means Boron has only 6 electrons and its octet is not complete, boron needs 2 more electrons to complete its octet. In BF_{3}, its octet is incomplete. Hence it is an electron deficient molecules so it acts as a Lewis acid.

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