In which of the following combination hybridisation of central atom (*) does not change? — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Step 1: Note that the asterisk (*) designates the nitrogen atom of NH3 in option (c): BF3 + NH3* -> F3B<-NH3*. Step 2: In free ammonia (NH3*), Nitrogen has 3 bond pairs and 1 lone pair, which is sp3-hybridized. In the coordinate adduct F3B<-NH3*, Nitrogen still has 4 electron domains (3 N-H bonds and 1 N-B coordinate bond). Step 3: Since Nitrogen remains sp3-hybridized before and after the reaction, its hybridization does not change.