Question

12. Which is the least resonance contributor of
methyl propenoate?
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Answer 1

Explanation:

3rd option should be the correct answer since, here carbon with + charge have incomplete octet and +and - charges are far apart that they tend to unstablise the molecule.

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Answer 2

The delocalization of electrons in a polyatomic ion or a molecule is described by resonance structures, which are sets of Lewis structures. Because of the presence of partial charges and fractional bonds, a single Lewis structure frequently fails to explain the bonding in a molecule/polyatomic ion.

THE THIRD ALTERNATIVE-

should be chosen because the carbon with the + charge has a completed octet and the + and - charges are so wide apart that they tend to unstabilize the molecule. Hence the third option is the least resonating structure of methyl propenoate.