Amongst the given structures , which are permissible resonance forms ?

Options

A. `overset(+)( C) H_(3) - underset(CH_(3))underset(|)(N)- overset(..) underset(..) (O):^(-)`
B. `CH_(2) = underset(CH_(3))underset(|)(N)= underset(..)(O):`
C. `CH_(2) = overset(+) underset(CH_(3))underset(|)(N)- overset(..)underset(..)(O):`
D. `:overset(-)( C)H_(3)- overset(+)underset(CH_(3))underset(|)(N)= underset(..) (O):`

Answer

B

Explanation

The structure shown in (b) has 10 electrons surrounding nitrogen, but the octet rule limits nitrogen to 8 electrons.