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Standard XII

Chemistry

Physical Properties

a Write the s...

Question

(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.

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Solution

$(b) (i) (C H_{3})_{3} N < C_{2} H_{5} N H_{2} < C_{2} H_{5} O H$
(ii) p -nitroaniline < Aniline < p -methylaniline

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Similar questions

(a) Illustrate the following reaction giving suitable example in each case:

(i) Hoffmann bromamide degradation reaction

(ii) Diazotisation

(iii) Gabriel phthalimide synthesis

(b) Distinguish between the following pairs of compounds:

(i) Aniline and N-methylaniline

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

(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) CuCN/KCN

(ii) $H_{2} O$

(iii) $C H_{3} C H_{2} O H$

(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

Q. (a) Illustrate the following reaction giving suitable example(s) in each case:
(i) hoffmann bromamide degradation reaction
(ii) diazotisation
(iii) gabriel phthalimide synthesis
(b) Distinguish between the following pairs of compounds:
(i) aniline and N-methylaniline
(ii)

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

and

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

OR
(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

(ii)

H_{2} O

(iii)

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-methyl aniline - in the increasing order of their basic strength

Q. Arrange the following in increasing order of their basic strength;
Aniline, p-nitroaniline, p-toulidine

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. (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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(b) (i) (CH3)3N<C2H5NH2<C2H5OH (ii) p -nitroaniline < Aniline < p -methylaniline

$(b) (i) (C H_{3})_{3} N < C_{2} H_{5} N H_{2} < C_{2} H_{5} O H$
(ii) p -nitroaniline < Aniline < p -methylaniline