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Consider structural formulas A, B and C ...

Consider structural formulas A, B and C :
`underset((A))(H_(2)overset(Ө)C - overset(o+)N -= N: )" "underset((B))(H_(2)C = overset(o+)N=overset(Ө)N: )" "underset((C))(H_(2)overset(o+)C - overset(..)N = overset(Ө)N : )`
(a) Are A, B and C constitutional isomers, or are they resonance forms?
(b) Which structures have a negatively charged carbon?
(c ) Which structures have a positively charged carbon?
(d) Which structures have a positively charged nitrogen?
(e ) Which structures have a negatively charged nitrogen?
(f) What is the net charge on each structure?
(g) Which is a more stable structure, A or B? Why?
(h) Which is a more stable structure, B or C? Why?

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