Phosgene (Cl2CO) is a poisonous gas used as a chemical weapon during World War I. It is a potential agent for chemical terrorism today. Draw the Lewis structure of phosgene. Include all three resonance forms by alternating the double bond among the three terminal atoms. Which resonance structure is the best?
Solution 96E Step 1 of In order to write Phosgene we have to put C in the middle and Cl and O atoms all around, like indicated below Step 2 Carbon belong to IV A group, thus it has 4 valence electrons Oxygen belong to VI A group, thus it has 6 valence electrons Chlorine belongs to VII A group, thus it has 7 valence electrons The total electrons in this molecule are can be obtaine by the formula Total electrons= (Valence electrons in C) + (Valence electrons in O) + 2 (valence electrons in Chlorine)= 4 + 6 +2(7)= 24 Step 3. Let’s form the bonding pair first We used 6 electrons of 24 Step 4 Let’s assign three lone pairs to the atoms of Chlorine and Oxygen We used 24 of 24 electrons