Increasing F-A-F Bond Angles: OF2, NF3, CF4, BeF3, BeF2

[MysticDude]

Homework Statement

Another chemistry question :D
Arrange the following AF_n species in order of increasing F-A-F bond angles: BeF₃, BeF₂, CF4₄, NF₃, and OF₂.

Homework Equations

The Attempt at a Solution

Ok so I'm thinking that it would be OF₂ first because it's bent and both of the lone pairs decrease the bond angles by around 2° each, making them 105.5°.

Next should be NF₃, the lone pair decreases the bond angle by 2° making it 107.5°.

Then I think that CF₄ is next because it would angles around 109.5°.

Next one the list I chose BeF₃ because the bond angles would be 120°.

Last I chose BeF₂ because it is linear, making the bond angles 180°.

So in the end OF₂ -> NF₃ -> CF₄ -> BeF₃ -> BeF₂

I hope that you can understand my logic and see if I'm right or wrong. Thanks for any help.

 

[k-rod AP 2010]

As far as I can see your methodology is correct and you seem to have the right answer. Just be careful and make sure how much the lone pairs decrease the bond angles for each distinct molecule because it can vary, for example 2 degrees for molecule A and 4 degrees for molecule B

 

[MysticDude]

Okay thanks for the answer. This question is pretty old though and I'm already past the unit in the class.