State reasons for the following:
(i) pKb value for aniline is more than that for methylamine.
(ii) Ethylamine is soluble in water whereas aniline is not soluble in water.
(iii) Primary amines have higher boiling points than tertiary amines.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.
Acetylation of aniline reduces its activation effect Because it result in decrease of electron density on nitrogen. Due to the resonance, the electron pair of nitrogen atom gets delocalised towards carbonyl group therefore so activation effect reduces.
Give reasons :
Although –NH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.