MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Introduction to p-block Elements

Specify the coordination geometry around and hybrid- ization of N and B atoms in 1:1 complex of BF3 and NH3:

A.N: tetrahedral, sp3 ; B:tetrahedral, sp3✓ Correct

B.N: pyramidal, sp3 ; B:pyramidal , sp3

C.N:pyramidal, sp3 ; B:planar, sp3

D.N:pyramidal, sp3 ; B:tetrahedral, sp3

Explanation

The hybridisation of nitrogen (N) and boron (B) in 3 3 3 NH and BF is sp (Pyramidal) and 2 sp (coplanar) re- spectively. Whereas in 1:1 complex of 3 3 NH and BF boron and nitrogen forms a dative bond and both will attain 3 sp hybridisation and tetrahedral geometry.

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