Give one chemical test to distinguish between the following pairs of compounds.
Aniline and N — methlyaniline.

Account for the following:
pK_b of aniline is more than that of methylamine.

Account for the following:
Ethylamine is soluble in water, whereas aniline is not.

Account for the following:
Methylamine in water reacts with ferric chloride to precipitate ferric hydroxide.

209.

Arrange the following:
In decreasing order of the pK_b values C₂H₅NH₂, C₆H₅ NHCH₃, (C₂H₅)₂NH and C₆H₅NH_2.

Arrange the following:
In decreasing order of basic strength:
C₆H₅NH₂, C₆H_sN(CH₃)₂, (C₂H₅)₂NH and CH₃NH₂