Account for the following:
$p K_{b}$ of aniline is more than that of methylamine.

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Solution

In aniline due to resonance, the lone pair of electrons on the $N -$ atom are delocalized over the benzene ring. Due to this, electron density on the nitrogen decreases. On the other hand, in ${C H}_{3} - {N H}_{2}$ , +I effect of ${C H}_{3}$ increases the electron density on the $N -$ atom. Consequently, aniline is a weaker base than methylamine and hence its $p K_{b}$ value is higher than that of methylamine.

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Q. Account for the following:
(i)

p K_{b}

of aniline is more than that of methylamine.
(ii) Ethylamine is soluble in water whereas aniline is not.
(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

Account for the following:

(i) pK_bof aniline is more than that of methylamine.

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

(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

(iv) Although amino group is o, p− directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

(v) Aniline does not undergo Friedel-Crafts reaction.

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.

Account for the following

(i) $p K_{b}$ of aniline is more than that of methyl amine.

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

(iii) Methyl amine in water reacts with ferric chloride to precipitate hydrated ferric oxide

(iv) Although amino group is o- and p- directing in aromatic electrophilic substitution, aniline on nitration gives a substantial amount of m-nitroaniline

(v) Aniline does not undergo Friedel Crafts reaction

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines

Give one chemical test to distinguish between the following pairs of compounds.

(i) Methylamine and dimethylamine

(ii) Secondary and tertiary amines

(iii) Ethylamine and aniline

(iv) Aniline and benzylamine

(v) Aniline and N-methylaniline.

{p K}_{b}

for aniline is more then of methylamine.

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

Account for the following:
$p K_{b}$ of aniline is more than that of methylamine.