Final answer:
The correct answer is (D) I, II and III, as all five nitrogenous bases are aromatic, planar, cyclic, and form heterocyclic compounds. Purines (adenine and guanine) have double rings and pyrimidines (cytosine, thymine, and uracil) have single rings, both of which are aromatic due to the delocalized electrons within their cyclic structures.
Step-by-step explanation:
The correct answer to the question of which statements relatingRegarding planarity and cyclic nature, all five nitrogenous bases are indeed planar and cyclic. They have a flat structure due to the presence of conjugated double bonds, which gives them stability.
All five nitrogenous bases indeed form heterocyclic compounds. They have atoms of different elements, such as nitrogen, within their ring structures.d have a single ring structure.
The purines, adenine and guanine, each consist of a pyrimidine ring fused to a five-member ring, each containing nitrogen atoms thus making them heterocyclic amines. In contrast, the pyrimidines, cytosine, thymine, and uracil, are heterocyclic amines with two nitrogen atoms in a six-member ring. All of these structures exhibit aromatic properties due to the delocalized electrons within their cyclic rings, which is why statement I is correct. Their planarity and cyclic nature fulfill statement II, and the inclusion of nitrogen in their cyclic structures fulfills statement III.
Regarding planarity and cyclic nature, all five nitrogenous bases are indeed planar and cyclic. They have a flat structure due to the presence of conjugated double bonds, which gives them stability.
All five nitrogenous bases indeed form heterocyclic compounds. They have atoms of different elements, such as nitrogen, within their ring structures.