11.3 Why does boron triflouride behave as a Lewis acid ?
The electronic configuration of boron is . 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 , its octet is incomplete. Hence it is an electron deficient molecules so it acts as a Lewis acid.