Answers: 1
is, 
![\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]](/tpl/images/0311/5755/9e987.png)
![\text{Number of electrons}=\frac{1}{2}\times [5+3]=4](/tpl/images/0311/5755/5f4d9.png)
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