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Pyridine is structurally similar to benzene, with a single
nitrogen atom substituting in the six-member aromatic ringfor one of the carbon and one of the hydrogen atoms, as follows:
Pyridine is a base. Its conjugate acid is a unipositive polyatomic ion called pyridinium, C5H5NH+.
Under conditions of standard temperature and pressure, pyridine is a liquid with a strong odor.