State reasons for the following:

(i) pK_b value for aniline is more than that for methylamine.

(ii) Ethylamine is soluble in water whereas aniline is not soluble in water.

The conversion of primary aromatic amines into diazonium salts is known as __________ .

Account for the following:
(i) Primary amines (R-NH₂) have higher boiling point than tertiary amines (R₃N).
(ii) Aniline does not undergo Friedel - Crafts reactions:
(iii) (CH₃)₂NH is more basic than (CH₃)₃N in an aqueous solution.

OR

Give reasons:
Acetylation of aniline reduces its activation effect.

Give reasons :
CH₃NH₂ is more basic than C₆H₅NH₂.

Give reasons :
Although –NH₂ is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Write the reactions involved in the following :

Diazotisation

Write the reactions involved in the following :

Gabriel phthalimide synthesis

Give reasons:
(CH₃)₂NH is more basic than (CH₃)₃N in an aqueous solution.

Give reasons:

Aromatic diazonium salts are more stable than aliphatic diazonium salts.