question_answer

Which of the following molecule in its valence shell has three bond pairs of electrons and one lone pair of electrons?

A) \[N{{H}_{3}}\]        

B) \[~{{H}_{2}}O\]

C) \[~B{{F}_{3}}\]           

D) \[~C{{O}_{2}}\]

Correct Answer: A

Solution :

 \[\text{N}{{\text{H}}_{\text{3}}}\]molecule in its valence shell has three bond pairs of electrons and one lone pair of electrons. The shape of \[\text{N}{{\text{H}}_{\text{3}}}\]molecule is pyramidal due to the presence of one lone pair electron. It has \[s{{p}^{3}}\]hybridisation.