# In which of the following compounds does Cl have the most positive partial charge?

The problem is :

In which of the following compounds does Cl have the most positive partial charge?

SCl2 ,, HCl ,, BrCl ,, OCl2 ,,

before I go through how I will solve this problem .. There is a question : Can Cl have a partial positive charge?

Well, all of them are polar, so there is a partial charge on each one of them

but how to compare or specify the partial charges?

The only thing I can think about is electronegativity

is it like .. the greater the difference in electronegativity the more the partial charges ?

Or .. ?

$\ce{Cl}$ can have a positive charge if it is bonded to something more electronegative like oxygen for example.
You specify the partial charges by looking at electronegativity AND how many are bonded to 1 atom. For example take Chlorine Heptoxide($\ce{Cl2O7}$):
Each $\ce{O}$ has a partial negative with the 1 in the center having the largest of the negative charges since it is bonded to 2 chlorines whereas the other 6 have smaller negative charges since they are each bonded to 1 chlorine.
Each $\ce{Cl}$ has a partial positive and they are equal since both of them are bonded to 4 oxygens.