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COCl2 is also called phosgene. First we need to count the total number of valence electron. We just add the valence electron of each atom involved.
C = 4
O = 6
Cl = 7 x 2
Next, we have to assign the central atom; In this case it is C.
Now we have to connect the atoms and form a bond. We have now C=O, and two C-Cl bonds
Finally, we have to distribute The remaining electrons on Cl and O. Remember the octet rule. COCl2 forms a trigonal planar and has an angle of approximately 120 degrees.
And it is a polar molecule :)
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