Class 11 Chemistry - Chapter The p Block Elements NCERT Solutions | Why does boron trifluoride behave as a L

Welcome to the NCERT Solutions for Class 11th Chemistry - Chapter The p Block Elements. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 3: why does boron trifluoride behave as a lewis acid....
Question 3

Why does boron trifluoride behave as a Lewis acid?

Answer

The electronic configuration of boron is ns2 np1. It has three electrons in its valence shell. Thus, it can form only three covalent bonds. This means that there are only six electrons around boron and its octet remains incomplete. When one atom of boron combines with three fluorine atoms, its octet remains incomplete. Hence, boron trifluoride remains electron-deficient and acts as a Lewis acid.

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