Which of these molecules has an overall dipole/soluble in water?

(Hint: sketch the molecule from the molecular formula--->determine shape--›presence of overall dipole)
1. OCIz
II. NHs
(central atom has been bolded)
Ill.
HCN IV. CHa
a. I only
b. I and II
c. I, Il, and III
d. I and IV
e. All of these
f. none of these

b. I and II