Chemical BondingMedium

Question

The correct formal charges on oxygen atoms numbered 2, 1 and 3 respectively are:

Options

A.-1, 0, +1
B.0, +1, -1
C.0, 0, 0
D.+1, 0, -1

Solution

Sol. [Key Concept: Formal charge = valence e⁻ − nonbonding − ½ bonding]

Formal charge $=$ Valence $\underset{(V)}{\text{~}\text{electrons}\text{~}} - \frac{1}{2}$ (shared $\left. \ \underset{(S)}{\text{~}\text{electrons}\text{~}} \right) - ($ non - bonding electrons $)$

Formal charge on $2^{\text{nd}\text{~}}$ oxygen atom $= 6 - \frac{1}{2}(4) - 4 = 0$

Formal charge on $1^{\text{st}\text{~}}$ oxygen atom $= 6 - \frac{1}{2}(6) - 2 = + 1$

Formal charge on $3^{\text{rd}\text{~}}$ oxygen atom $= 6 - \frac{1}{2}(2) - 6 = - 1$

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