Which of the following resonating structures | vedclass

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(C) The stability of resonating structures is determined by the following rules: $1$. Structures with complete octets for all atoms are more stable. $

Vedclass · Accepted Answer

$\overset{\ominus}{C}H_2 - \overset{\oplus}{C}H - CH = CH - O - CH_3$

Vedclass · Answer

(C) The stability of resonating structures is determined by the following rules: $1$. Structures with complete octets for all atoms are more stable. $2$. Structures with more covalent bonds are more stable. $3$. Structures with negative charge on more electronegative atoms and positive charge on less electronegative atoms are more stable. In structures $(A)$ and $(B)$,all atoms have complete octets. In structure $(D)$,the positive charge on carbon is stabilized by the lone pair of the adjacent oxygen atom (octet is complete). In structure $(C)$,the carbon atom with the positive charge has an incomplete octet ($6$ electrons) and there is no adjacent atom with a lone pair to stabilize it. Therefore,structure $(C)$ is the least stable.

Which of the following resonating structures of $1$-methoxy-$1, 3$-butadiene is least stable?

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Which of the following is not a pair of resonating structures?

Explain why the following two structures,$I$ and $II$,cannot be the major contributors to the real structure of $CH_{3}COOCH_{3}$.
$I: CH_{3}-C^{+}(O^{-})-OCH_{3}$
$II: CH_{3}-C(=O^{-})-OCH_{3}^{+}$

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