Write electron dot and line structure for
(a) `SeO_(3)^(2-)` ,(b) `Li_(3)PO_(4)` ( c ) `ClO_(2)^(Θ)` (d) `COCl_(2)`
(e) `H_(2)CO`
(f) `C_(2)H_(2)` (g) `HCO_(2)H` .

Explanation

(i) `V` (Total number of valence `e^(-')s`) `=6 +3 xx 6 +2 = 26 e^(-')s`
(ii) `O` (Total number of `e^(-')s` for octet) `= 8 + 3 xx 8 = 32 e^(-')s`
(iii) `S` (Shared `e^(-')s) = ( O-V) = (32 -26) =6 e^(-')s`
(iv) Skeletal structure with 6 shared `e^(-')s`
(v) `U` (unshared `e^(-')s ) = (V -S) = (26 -6) =20 e^(-')s`
(vi) Add 20 unshared `e^(-')s` to complete the Lewis dot structure
(b) (i) `V =5 + 4 xx 6 + 3 = 32 e^(-')s`
(ii) `O = 8 + 4 xx 8 = 40 e^(-')s`
(iii) `S =(O -V) = (40 -32) = 8 e^(-')s`
(iv) Skeletal structure with 8 shared `e^(-')s`
(v) `U = (V =S) = (32 -8) = 24 e^(-')s`
(vi) Add 24 `e^(-')s` to complete the Lewis dot structure
(c ) `CIO_(2)^(Θ)`
(i) `V =7 + 2 xx 6 + 1 = 20 e^(-')s`
(ii) `O =8 + 2 xx 8 = 24 e^(-')s`
(iii) `S = (O -V) = (24 - 20) = 4 e^(-')s`
(iv) Skeletal structure with 4 shared `e^(-')s`
(v) `U = (V -S) = (20 -4) = 16 e^(-')s`
(vi) Add `16e^(-')s` to complete the Lewis dot structure
(d) `COCI_(2)`
(i) `V =4 + 6 + 2 xx 7 = 24 e^(-')s`
(ii) `O = 8 + 8 + 2 xx 8 = 32 e^(-')s`
(iii) `S =(O-V) = (32 -24) = 8e^(-')s`
(iv) Skeletal structure with 8 shared `e^(-')s`
(v) `U = (V -S) = (24 -8) =16e^(-')s`
(vi) Add `16e^(-')s` to complete the Lewis dot structure
(e) `H_(2)CO`
(i)`V =1 xx 2 + 4 +6 = 12 e^(-')s`
(ii) `O =2 xx 2 + 8 + 8 = 20 e^(-')s`
(iii) `S =(O -V) = (20 -12) = 8 e^(-')s`
(iv) Skeletal structure with 8 shared `e^(-')s`
(v) `U = (V -S) = (12 -8) = 4 e^(-')s`
(vi) Add `4e^(-')s` to complete the Lewis dot structure
(f) `C_(2)H_(2)`
(i) `V =2 xx 4 + 1 xx 2 = 10 e^(-')s`
(ii) `O =2 xx 8 + 2 xx 2 = 20 e^(-')s`
(iii) `S =(O -V) = (20 - 10) = 10 e^(-')s`
(iv) Skeletal structure with 10 shared `e^(-')s (v) U =(V -S) = (10 - 10) =` Zero
(vi) Hence skeletal structure is the Lewis dot structure
(g) `HCO_(2)H`
(i) `V =1 + 4 +2 xx 6 + 1 = 18 e^(-')s`
(ii) `O =2 + 8 + 2 xx 8 + 2 = 28 e^(-')s`
(iii) `S =(O -V) = (28 - 18) = 10e^(-')s`
(iv) Skeletal structure with 10 shared `e^(-')s`
`U = (V -S) = (18 -10) = 8 e^(-')s`
(vi) Add `8 e^(-')s` to complete the Lewis dot structure