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Amines as Bases

Give reason:T...

Question

Give reason:
The $p K_{b}$ of aniline is greater than methylamine.

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Solution

Higher the value of pKb lesser is the acidic character .
Aniline has higher pKb than methylamine because methylamine is more acidic than aniline as in methylamine delocalisation of lone pair of electrons belonging to nitrogen occurs as a result resonance structures are formed which increase the acidic character of methylamine as a result it has lesser pKb value.

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Similar questions

{p K}_{b}

for aniline is more then of methylamine.

p K_{b}

of aniline is more than that of methylamine.
If this is true enter 1, if false enter 0.

p K b

of aniline is more than that of methylamine. Reason: In aniline, the lone pair of electrons on the

N

atom is delocalized over the benzene ring. As a result, the electron density of nitrogen decreases. In contrast, in

{C H}_{3} {N H}_{2} (+ I)

{C H}_{3}

increases the electron density on the

N

atom. Therefore, aniline is a weaker base than methylamine and hence its

p K_{b}

value is higher than that of methylamine.

Q. Among methylamine and aniline, the number of

C

atoms in compound with lower

p K_{b}

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.

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Amines as Bases

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