A covalent molecule `AB_(3)` has pyramidal structure. The number of lone pair and bond pair electrons in the molecule are respectively.

Options

A. 0 and 4
B. 3 and 1
C. 1 and 3
D. 2 and 2

Answer

C

Explanation

In general a compound with formula `AB_(3)` is `sp^(2)` hybridised with triangular planar geometry. However, the given compound has pyramidal structure which is possible only when it has a lone pair of electrons. Thus `AB_(3)` has 3 bond pairs and one lone pair.