Arrange the following
(i) In decreasing order of the $p K_{b}$ values: $C_{2} H_{5} N H_{2}, C_{6} H_{5} N H C H_{3}, (C_{2} H_{5})_{2} N H$ and $C_{6} H_{5} N H_{2}$
(ii) In increasing order of basic strength: $C_{6} H_{5} N H_{2}, C_{6} H_{5} N (C H_{3})_{2}, (C_{2} H_{5})_{2} N H$ and $C H_{3} N H_{2}$
(iii) In increasing order of basic strength:
(a) Aniline, p-nitroaniline and p-toluidine

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Solution

(i) Stronger base has lower $p K_{b}$ value.
$C_{6} H_{5} N H_{2} > C_{6} H_{5} N H C H_{3} > C_{2} H_{5} N H_{2} > (C_{2} H_{5})_{2} N H$
(ii) Increasing order of basicity is as follows:
$C_{6} H_{5} N H_{2} < C_{6} H_{5} N H C H_{3} < C H_{3} N H_{2} < (C_{2} H_{5})_{2} N H$
(iii) Increasing order of basic strength.
(a) p-nitroaniline < aniline < p-toluidine
(b) $P h N H_{2} < P h N H C H_{3} < P h C H_{2} N H_{2}$
(iv) In decreasing order of basic strength in gas phase:
$E t_{3} N > E t_{2} N H > E t N H_{2} > N H_{3}$
The stabilization of conjugate acids due to hydrogen bonding is absent.
(v) Increasing order of boiling point
$M e_{2} N H < E t N H_{2} < E t O H$
(vi) Increasing order of solubility in water:
$P h N H_{2} < E t_{2} N H < E t N H_{2}$

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Similar questions

Arrange the following:

(i) In the decreasing order of the $p K_{b}$ values
$C_{2} H_{5} N H_{2}, C_{6} H_{5} N H C H_{3}, (C_{2} H_{5})_{2} N H$ and $C_{6} H_{5} N H_{2}$

(ii) In increasing order of basic strength:
$C_{6} H_{5} N H_{2}, C_{6} H_{5} N (C H_{3})_{2}, (C_{6} H_{5})_{2} N H a n d C H_{3} N H_{2}$

(iii) In increasing order of basic strength:
(a) Aniline, p-nitroaniline and p-toluidine
(b) $C_{6} H_{5} N H_{2}, C_{6} H_{5} N H C H_{3}, C_{6} H_{5} C H_{2} N H_{2}$

(iv) In decreasing order of basic strength in gas phase :

$C_{2} H_{5} N H_{2}, (C_{2} H_{5})_{2} N H, (C_{2} H_{5})_{3} N a n d N H_{3}$

(v) In increasing order of boiling point:

$C_{2} H_{5} O H, (C H_{3})_{2} N H, C_{2} H_{5} N H_{2} .$

(vi) In increasing order of solubility in water :

$C_{6} H_{5} N H_{2}, (C_{2} H_{5})_{2} N H, C_{2} H_{5} N H_{2} .$

Q. Arrange the following in increasing order of their basic strength:

C_{2} H_{5} N H_{2}, C_{6} H_{5} N H_{2}, N H_{3}, C_{6} H_{5} C H_{2} N H_{2}

and

(C_{2} H_{5})_{2} N H

Q. Arrange the following in the increasing order of their basic strength:

C_{2} H_{5} N H_{2}

C_{6} H_{5} N H_{2}

(C_{2} H_{5})_{2} N H

Q. Arrange the following in increasing order of their basic strength:

C_{2} H_{5} N H_{2}, (C_{2} H_{5})_{2} N H, (C_{2} H_{5})_{3} N, C_{6} H_{5} N H_{2}

Arrange the following in increasing order of their basic strength:

(i) C₂H₅NH₂, C₆H₅NH₂, NH₃, C₆H₅CH₂NH₂ and (C₂H₅)₂NH

(ii) C₂H₅NH₂, (C₂H₅)₂NH, (C₂H₅)₃N, C₆H₅NH₂

(iii) CH₃NH₂, (CH₃)₂NH, (CH₃)₃N, C₆H₅NH₂, C₆H₅CH₂NH₂.

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Arrange the following(i) In decreasing order of the pKb values: C2H5NH2,C6H5NHCH3,(C2H5)2NH and C6H5NH2(ii) In increasing order of basic strength: C6H5NH2,C6H5N(CH3)2,(C2H5)2NH and CH3NH2(iii) In increasing order of basic strength: (a) Aniline, p-nitroaniline and p-toluidine