question_answer

Which of the following species contains three bond pairs and one lone pan- around the central atom?

A) \[NH_{2}^{-}\]

B) \[PC{{l}_{3}}\]

C) \[{{H}_{2}}O\]

D) \[B{{F}_{3}}\] 

Correct Answer: B

Solution :

\[PC{{l}_{3}}\]has \[s{{p}^{3}}-\]hybridization and possesses one lone pair on P-atom and three bond pair of electrons \[\begin{align}   & {{(s{{p}^{3}})}^{2}}\,\,\,\,{{(s{{p}^{3}})}^{2}}\,\,\,\,{{(s{{p}^{3}})}^{1}}\,\,\,\,{{(s{{p}^{3}})}^{1}} \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\vdots \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\vdots \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\vdots  \\  & \,\,\,\,\,\,\,\,\,\,\,\,3p\,of\,\,\,\,\,\,\,\,\,\,\,3p\,of\,\,\,\,\,\,3p\,of \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl \\ \end{align}\]