Question

Explain the following observations in a concise manner. Use equations, mechanisms, diagrams and/or resonance structures to illustrate your answer. i. The following anion (II) spontaneously rearranges to a monocyclic anion with unusual stability. Make sure to include the structure of the rearranged product in your answer. I1 [4 marks The following molecule (II) undergoes umusually facile rotation about the central double bond, whereas "normal" double bonds will not rotate in such a manner. ii. Hас Нс CH3 CHS 14 marks Write a reasonable mechanism for the following reactions, making sure to show all of the important resonance structures of any intermediates formed. NHCH3 Br CH3NH2 HЕr NO2 NO2 16 marks]

Answer 1

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The anion is easily stabilised as it can participate in resonance withe other couble bond. The anion can move the with in the bands 2 g

The possibility of existance as et le bord due to reso cance Struneture helps the molemle to rotate freely. If resonance doesn't exist double bond will not rotate