Which is not an acceptable Lewis structure for the anion CH₂NCO^-?

Name: Which is not an acceptable Lewis structure for the anion CH 2 NCO - ?
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Question

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Lewis structures I, II, and IV are all acceptable and follow the octet rule for all atoms. However, structure III has a sulfur atom with only six electrons in its valence shell, violating the octet rule. Therefore, C is not an acceptable Lewis structure for the given anion.

Which Is Not an Acceptable Lewis Structure for the Anion