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Which of the following molecules is polar? A B H 3 ​ B N F 3 ​ C C 2 ​ H 6 ​ D S F 6 ​ E C C l 4 ​

Which of the following molecules is polar?

A

BH3

B

NF3

C

C2H6

D

SF6

E

CCl4

Grade:9

1 Answers

Omveer Singh
askIITians Faculty 52 Points
2 years ago

Nitrogen has 5 valence electrons. Each Fluorine atom has 7 valence electrons. Thus to complete their octets three Fluorine atoms and one Nitrogen atom share their valence electrons mutually.

Three electrons of Nitrogen are involved in bond formation with three Fluorine atoms. Still, two electrons remain as a lone pair on Nitrogen atom. Thus, this lone pair repels the bond pair and the structure of Nitrogen trifluoride is assymmetric in nature. It is pyramidal in shape.
Because of the presence of the lone pair above Nitrogen atom, and this shape, NF3 is a polar molecule.
Option B is the correct answer.

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