Draw the bonding pattern of the resonance structure that would result from moving the electrons in the way indicated by the curved arrows (include double bonds, lone pairs and any formal charges).
a.
- Lone pair from O moves to form a double bond with C
- Double bond between C and N moves to form a lone pair on N
- Formal charge on C
- Formal charge on N

b.
- Double bond between O and C moves to form a lone pair on O
- Lone pair from N moves to form a double bond with C
- Formal charge on O
- Formal charge on N

c.
- Double bond between O and C moves to form a lone pair on O
- Double bond between C and N moves to form a lone pair on N
- Formal charge on O
- Formal charge on N

d.
- Double bond between O and C moves to form a lone pair on O
- Lone pair from N moves to form a double bond with C
- Formal charge on O
- Formal charge on N