Pyrimidines are

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(A) Pyrimidines are heterocyclic aromatic organic compounds similar to benzene and pyridine,containing two nitrogen atoms at positions $1$ and $3$ of

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Single ring compounds

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(A) Pyrimidines are heterocyclic aromatic organic compounds similar to benzene and pyridine,containing two nitrogen atoms at positions $1$ and $3$ of the six-membered ring.They consist of a single six-membered ring structure.In contrast,purines are double-ring compounds consisting of a pyrimidine ring fused to an imidazole ring.Therefore,pyrimidines are single-ring compounds.

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