Write resonance structure of $C H_{2} = C H - C H O$ . Indicate relative stability of the contributing structures.

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Solution

I: Most stable, more number of covalent bonds, each carbon and oxygen atoms has an octet and no separation of opposite charge.
II: Negative charge on more electronegative atom and positive charge on more electronegative atom and positive charge on more electropositive atom.
III: Does not contribute as oxygen has positive charge and carbon has negative charge, hence least stable.

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C H_{2} = C H - C H O

I . ⊖ C H_{2} - \oplus C H - C H = C H - O - C H_{3}

I I . ⊖ C H_{2} - C H = C H - \oplus C H - O - C H_{3}

I I I . C H_{2} = C H - ⊖ C H - \oplus C H - O - C H_{3}

I V . C H_{2} = C H - ⊖ C H - C H = \oplus O - C H_{3}

C H_{2} = C H - C H = C H - O - C H_{3}

C H_{2} = C H - C H = O I ⟷ \oplus C H_{2} - C H = C H - ⊝ O I I

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