question_answer

In which of the following molecules are all the bonds not equal?            [AIPMT (S) 2006]

A)  \[Cl{{F}_{3}}\]           

B)  \[B{{F}_{3}}\]

C)  \[Al{{F}_{3}}\]     

D)                  \[N{{F}_{3}}\]

Correct Answer: A

Solution :

In \[Cl{{F}_{3}}\] all bonds are not equal due to trigonal - bipyramidal (\[s{{p}^{3}}\] d-hybridisation) geometry of \[Cl{{F}_{3}}\] molecule.

\[B{{F}_{3}}\] and \[Al{{F}_{3}}\] show trigonal   symmetric structure due to \[s{{p}^{2}}\]-hybridisation.

\[N{{F}_{3}}\] shows pyramidal geometry due to \[s{{p}^{3}}\] hybridisation.