<p>What are the resonance structures for [H2CNO2]-? Theproblem asks for the major and minor contributors. The answer keysays that there are two structures in which the only double bondswitches between the two NO bonds. (Both have the same energy-inother words no minor contributors)</p>
<p>My question is why can't there be a structure in whichthere's a single bond between all of the atoms? Also why can'tthere be a structure in which there's a double bond between the Cand N atoms? For both situations the overall charge would still be-1. </p>
<p>My other question is when drawing resonance structures thenumber of unpaired electrons should be the same but I've seenexamples (like for [CH3OCH2]+) in which there's two pairs ofunpaired electrons for the minor contributor but one pair for themajor contributor. Why is this? Is this rule only for structures ofthe same energy? </p>
<p>What are the resonance structures for [H2CNO2]-? Theproblem asks for the major and minor contributors. The answer keysays that there are two structures in which the only double bondswitches between the two NO bonds. (Both have the same energy-inother words no minor contributors)</p>
<p>My question is why can't there be a structure in whichthere's a single bond between all of the atoms? Also why can'tthere be a structure in which there's a double bond between the Cand N atoms? For both situations the overall charge would still be-1. </p>
<p>My other question is when drawing resonance structures thenumber of unpaired electrons should be the same but I've seenexamples (like for [CH3OCH2]+) in which there's two pairs ofunpaired electrons for the minor contributor but one pair for themajor contributor. Why is this? Is this rule only for structures ofthe same energy? </p>
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