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Standard XII

Chemistry

Oxidizing Nature of Sulphuric Acid

Arrange the f...

Question

Arrange the following in increasing order of boiling points:
$(C H_{3})_{3} N, C_{2} H_{5} O H$ and $C_{2} H_{5} N H_{2}$

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Solution

$B o i l i n g p o i n t \propto H y d r o g e n b o n d i n g$

In $(C H_{3})_{3} N$ , hydrogen bonding is absent.

In $C_{2} H_{5} O H$ , inter-molecular hydrogen bonding exists and the extent of hydrogen bonding is greater due to the electronegativity of oxygen.

In $C_{2} H_{5} N H_{2}$ , inter-molecular hydrogen bonding is present to a lesser extent because the electronegativity of nitrogen is less than that of oxygen, so the order of boilling point will be:
$C_{2} H_{5} O H > C_{2} H_{5} N H_{2} > (C H_{3})_{3} N$

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Similar questions

Q. Arrange the following in the increasing order of boiling point:

(i) $C_{2} H_{5} O H$

(ii) $(C H_{3})_{2} N H$

(iii) $C_{2} H_{5} N H_{2}$

Q. (a) Write the structures of main products when benzene diazonium chloride

(C_{6} H_{5} N_{2}^{+} C l^{-})

reacts with the following reagents :
(i)

C u C N / K C N

(i i) H_{2} O

(i i i) C H_{3} C H_{2} O H

(b) Arrange the following:

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

- in the increasing order of their boiling point.
(ii) Aniline, p-nitroaniline, p-methylaniline - in the increasing order of their basic strength.

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 the decreasing order of boiling point:
(i)

C_{2} H_{5} O H

(ii)

(C H_{3})_{2} N H

(iii)

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

Q. (a) Write the structure of main products when anline reacts with the following reagents.
(i)

B r_{2} w a t e r

(ii) HCl
(iii)

(C H_{3} C O)_{2} O / p y r i d i n e

(b) Arrange the following in the increasing order of their boiling poin.

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

(C H_{3})_{2} N H a n d (C H_{3})_{3} N

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Arrange the following in increasing order of boiling points: (CH3)3N,C2H5OH and C2H5NH2

Arrange the following in increasing order of boiling points:
$(C H_{3})_{3} N, C_{2} H_{5} O H$ and $C_{2} H_{5} N H_{2}$