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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What will be the resonance energy of $N_2O$ from the following data: $\Delta H_f(N_2O) = 82 \ kJ \ mol^{-1}$. Bond energies of $N \equiv N$,$N = N$,$O = O$,and $N = O$ bonds are $946$,$418$,$498$,and $607 \ kJ \ mol^{-1}$ respectively.

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