Chesmistry 12|VSEPER Problems|Quick Problems

[Raza]

Hi,
I am confused with this molecule's VSEPER diagram.
I was told to draw the VSEPER diagram for C₂H₂
This is what I drew:
http://www.albumtown.com/data/c44e503833b64e9f27197a484f4257c0/1142_p807888.jpeg
Then, it asked me to name the number and type of clouds on the central atom with the bond angles. This is where I am confused.
Does it have 5 clouds?
Is the bond angles 120⁰ in the plane and 90⁰ in vertical?

 

[Astronuc]

There should be a discussion of sigma and pi bonds in your chemistry textbook.

In H - C = C - H, the triple bond is composed of 1 sigma and two pi bonds. The H-C is a sigma bond.

There is a nice brief discussion of molecular shapes and bonds here -
http://www.chem.hope.edu/~chemboard/f05/messages/15/Molecular_Shapes_Lab-1308.pdf

See also -

http://www.chem.unl.edu/cak/bk5.htm

http://www.utdallas.edu/~parr/chm1341/13410618.html

 

[Blueshift5]

Hi there,
Thank you for sharing your VSEPER diagram for C2H2. From what I can see, your diagram is correct. C2H2 has a linear molecular geometry with a bond angle of 180 degrees. This means that the central atom (carbon) has two bonding pairs and zero lone pairs, resulting in a total of two clouds. The bond angles are indeed 180 degrees, which is consistent with a linear geometry. I hope this helps clarify your confusion. Keep up the good work!