1. Carbon tetrachloride CCl4, and dichloromethane CH2Cl2 both have tetrahedral m
ID: 1028848 • Letter: 1
Question
1. Carbon tetrachloride CCl4, and dichloromethane CH2Cl2 both have tetrahedral molecular geometries. Which of these is polar and which is nonpolar? Explain.
2. Based on their molecular formulas you might expect the two substances phosphorous trichloride PCl3, and boron trichloride BCl3 to have similar properties and shapes. Which of the two substances is polar and which is nonpolar? Explain.
3. In which of the molecules CH4 or COCl2, do you think the actual bond angles are closer to those predicted by VSEPR? Explain
4. Using formal charge, determine the correct structure for the molecule XeO4. How do you know?
5. You should have determined that SO2 is polar and SO3 is nonpolar. Explain why
Explanation / Answer
Ans 1 :
The polarity of molecules is not only determined by the polarity of their bonds , but also the orientation of these bonds in the space.
CCl4 has all polar bonds , but even then the molecule is non polar because the shape of the molecule is symmetrical tetrahedral which cancels out the bond polarity resulting in the 0 net dipole moment.
The CH2Cl2 molecule is polar , as their is difference in the polarities of C-Cl and C-H bonds due to which the polarity does not cancel out , and there is a net dipole moment.
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