MCQ
In which of the following reaction, the hybridisation of the central atom changes from $sp^2$ to $sp^3$ ?
- ✓$N{H_3}\, + \,{H^ + }\, \to \,NH_4^ + $
- B$Al{F_3}\, + \,3{F^ - }\, \to \,AlF_6^{3 - }$
- C$B{F_3}\, + \,{F^ - }\, \to \,BF_4^ - $
- D${H_2}O\, + \,{H^ + }\, \to \,{H_3}{O^ + }$