Dipole-Dipole Attraction in Molecules: Analysis of BCl3, XeF4, AsH3, and SCl3

[yecko]

Homework Statement

http://i.imgur.com/8pFdEDX.png

Homework Equations

polarity of the element

The Attempt at a Solution

BCl3 is a trigonal planar which the forces would be balanced. Thus it is a neutral substance.
XeF4 is with tetrahedral shape where one side is a lone pair, which the charge is imbalanced and it has dipole dipole attraction between molecules.
However, I don't know the other two - AsH3 and SCl3, which one is with dipole dipole attraction between molecules? And why? Thank you very much!

 

[Borek]

It is about shape of these molecules - are they symmetric enough to have a zero dipole moment?

 

[Ygggdrasil]

A good starting point would be to draw the Lewis structures of each compound so that it's easier to figure out their geometry.

 

[yecko]

OK. I found AsH3 is with tetrahedral shape where one side is a lone pair, which the charge is imbalanced and it has dipole dipole attraction between molecules.

However, i can't even draw the electron diagram of SCl3. It seems there is a non-paired electron. There also no resources on SCl3 on the Internet.
The most similar structure I found is this one, SCl4. <https://upload.wikimedia.org/wikipedia/commons/2/24/Sulfur_tetrachloride.svg >
How to draw the Lewis structures of SCl3?
Thanks

 

[Ygggdrasil]

I agree, SCl3 does not seem like it would be a stable compound. Can you check whether there was a typo in the question?