Discussion
The F-N-F bond angle in NF3 is :
Answer: C
The F-N-F bond angle in NF3 is about 102° 30′.
NF3 is pyramidal, with three bond pairs and one lone pair on nitrogen. The lone pair compresses the angles below the tetrahedral 109° 28′. In NF3 the compression is larger than in NH3 because fluorine is more electronegative than nitrogen and pulls the bonding electrons away from nitrogen, so the bond pairs repel each other less and the lone pair pushes them closer together. The measured angle is about 102°.
107° 48′ is close to the angle in NH3 (about 107°), where the bond pairs sit nearer nitrogen. 104° 27′ is the angle in water, and 109° 28′ the ideal tetrahedral angle.
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