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Aromatic Compounds: Pyridine, Quinoline, and Isoquinoline

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All three are equally basic

Pyridine and quinoline are basic, while isoquinoline is not basic (correct)

Pyridine is not basic, while quinoline and isoquinoline are basic

Pyridine and isoquinoline are basic, while quinoline is not basic

1-,4-,6- (β- and γ-alkyl)

1-,3-,5- (α- and γ-alkyl)

2-,4-,6- (α- and γ-alkyl) (correct)

2-,3-,5- (β- and γ-alkyl)

Pyridine is not aromatic, while quinoline is aromatic

Pyridine and quinoline are not aromatic

Quinoline is not aromatic, while pyridine is aromatic

Pyridine and quinoline are both aromatic (correct)

Pyridine, quinoline, and isoquinoline are heterocyclic compounds, but they have distinct differences in their basic characters.

In pyridine, the α-positions (2, 4, and 6) of alkyl groups are more reactive than when attached to benzene.
This is due to the electron-withdrawing effect of the nitrogen atom in pyridine.

Pyridine and quinoline both exhibit aromatic properties, but with some differences.
Pyridine has a higher degree of aromaticity due to the electron-donating effect of the nitrogen atom.
Quinoline has a lower degree of aromaticity due to the presence of a benzene ring, which reduces the electron-donating effect of the nitrogen atom.