Which of the following pairs of canonical for | vedclass

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(D) Canonical forms contribute equally to the resonance hybrid if they are equivalent,meaning they have the same energy and the same arrangement of at

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All of these

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(D) Canonical forms contribute equally to the resonance hybrid if they are equivalent,meaning they have the same energy and the same arrangement of atoms.$1$. In $CH_3NO_2$,the two resonance structures are not equivalent because one has a double bond to one oxygen and a single bond to the other,but the formal charges are different in nature compared to the acetate ion.$2$. In the acetate ion $(CH_3COO^-)$,the two resonance structures are equivalent because both oxygen atoms carry a negative charge and are bonded to the carbon atom in the same way.$3$. In the guanidinium ion $([C(NH_2)_3]^+)$,there are three equivalent resonance structures where the positive charge is delocalized equally over the three nitrogen atoms.Since both $B$ and $C$ represent systems with equivalent resonance structures,and the question asks for pairs that contribute equally,the most appropriate answer is $D$ as all these systems exhibit resonance where the canonical forms are equivalent or contribute significantly to the stability of the hybrid.

Which of the following pairs of canonical forms contribute equally to the resonance hybrid?

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