The difference between Diazine and Pyridazine
When used as nouns, diazine means any six-membered aromatic heterocycle containing four carbon atoms, two nitrogen atoms and three double bonds, whereas pyridazine means a diazine in which the two nitrogen atoms are in the ortho- positions.
check bellow for the other definitions of Diazine and Pyridazine
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Diazine as a noun (organic compound):
Any six-membered aromatic heterocycle containing four carbon atoms, two nitrogen atoms and three double bonds
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Pyridazine as a noun (organic compound):
A diazine in which the two nitrogen atoms are in the ortho- positions; many of its derivatives are pharmaceuticals, herbicides etc