question_answer

Which of the following pair of molecules will have permanent dipole moment for both members?

A)  \[N{{O}_{2}}\] and \[C{{O}_{2}}\]          

B)  \[N{{O}_{2}}\] and \[{{O}_{3}}\]

C)  \[Si{{F}_{4}}\] and \[C{{O}_{2}}\]          

D)  \[Si{{F}_{4}}\] and \[N{{O}_{2}}\]

Correct Answer: B

Solution :

Dipole moment \[(\mu )\] for \[C{{O}_{2}}\] and \[Si{{F}_{4}}\] is zero because they have symmetrical structure. \[O=C=O\] and  \[N{{O}_{2}}\] and \[{{O}_{2}}\] are bent molecules with permanent dipole moment.