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a) Why is it difficult to diprotonate a diazine? (1 mark) b) Which is the only chlorodiazine that does not undergo easy nucleophilic substitution of

a) Why is it difficult to diprotonate a diazine? (1 mark)

b) Which is the only chlorodiazine that does not undergo easy nucleophilic substitution of the chloro group, and why? (2 mark)

N. pyridazine pyrimidine pyrazine

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