Question

Aniline is weaker base than amonia while methyl amine is astronger base than amonia why

Answer 1

In aniline the line pair of electron is conjugated so basecity decreases in methyl amine CH3- is a releasing group so the electron density on N increases so basesity increases

Answer 2

Aniline is a weaker base than cyclohexyl amine?

Aniline is a weak base than cyclohexylamine because aniline is an aromatic ring, because of the electron-withdrawing effect of the phenyl group aniline is a weak base.