Stability Order of resonating structures

[randomgamernerd]

I have uploaded the picture of the structures because I couldn't figure out how to type.
Its vinyl chloride.

According to me the order should be
I>III>II
because I has no charge so it must be most stable
in II we have Cl an electronegative element bearing positive charge which makes it unstable.
Hence I get the order.
But the book says the order is I>II>III
Please Help

 

[mjc123]

How many electrons are in the valence shell of the Cl in III?

 

[randomgamernerd]

How many electrons are in the valence shell of the Cl in III?

apparently 10how is that possibleit can hold at max 8 if I'm not wrong

 

[mjc123]

So III is not a permissible resonance structure according to the ordinary rules.