Which one of the nitrogen atoms in H_2N-NH-CO | vedclass

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(B) The nucleophilicity of a nitrogen atom depends on the availability of its lone pair of electrons for donation.In the given molecule,$H_2N-NH-CO-NH

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$I$

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(B) The nucleophilicity of a nitrogen atom depends on the availability of its lone pair of electrons for donation.In the given molecule,$H_2N-NH-CO-NH_2$ (semicarbazide/urea derivative structure):- The nitrogen atom labeled $III$ has its lone pair involved in resonance with the adjacent carbonyl group $(C=O)$,making it less available.- The nitrogen atom labeled $II$ has its lone pair involved in resonance with the carbonyl group,and it is also attached to another nitrogen atom,which further reduces its availability.- The nitrogen atom labeled $I$ has its lone pair available for donation because it is not directly involved in resonance with the carbonyl group. Although it is attached to another nitrogen atom,its lone pair is the most available among the three for acting as a nucleophile.Therefore,the nitrogen atom labeled $I$ is the most nucleophilic.

Which one of the nitrogen atoms in $H_2N-NH-CO-NH_2$ (where the atoms are labeled $I, II, III$ as shown in the structure) is the most nucleophilic?

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