Dear Shuranjan,
Although it's over 40 years since I was a practicing chemist, as far as I can tell, neither one of your formulas, as I unpack them, appears to correspond to a stable molecule, because carbon's valence is 4 bonds.
Both formulas appear to require 5 bonds for the carbon atom that is positioned 2nd from the right-hand end of your formulas.
I doubt there's even a short-lived transition state that would correspond.
Hope this helps - Paul
PS After checking your profile, I'm wondering whether I've missed something - for someone as highly qualified as you are, it seems like too simple a question (?)
Now, I don't see what the problem is, Shuranjan.
It doesn't look like one is correct and the other is false, if that's what you're asking.
These are different structures combining 4 C, 8 H and one O atom, both being a multiply substituted ethylene.
As far as I can tell, they're both valid, though I'd expect them to have moderately different properties, but not so different that one would spontaneously rearrange itself into the other.
If it's the notation that's your concern, the first one is fine, and I can't see a better way to represent the second one, tho' I might not be up-to-date with any recent changes in IUPAC notation.
If I'm completely missing the point of the question, please state it explicitly.
Regards - Paul
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