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Standard XII

Chemistry

Preparation of Carboxylic Acids

a Write the s...

Question

(a) Write the structures of the main products of the following reactions :

(b) Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline.

(c) Arrange the following in the increasing order of their $p K_{b}$ values :
$C_{6} H_{5} N H_{2}, C_{2} H_{5} N H_{2}, C_{6} H_{5} N H C H_{3}$

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Solution

(b) Aniline + $C H C I_{3} + K O H \to A l k y l i s o c y a n a t e (s t r o n g s m e l l i n g s u b s t a n c e)$

N, N-dimethylaniline + $C H C I_{3} + K O H \to$ No reaction

(c) $C_{2} H_{5} N H_{2} < C_{6} H_{5} N H C H_{3} < C_{6} H_{5} N H_{2}$

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Similar questions

Q. (a) Write the structures of the main products of the following reactions :

(b) Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline.

(c) Arrange the following in the increasing order of their

p K_{b}

values :

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

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

(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. Arrange the following in the increasing order of their

p K_{b}

values.

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

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 :

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

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(a) Write the structures of the main products of the following reactions : (b) Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline. (c) Arrange the following in the increasing order of their pKb values : C6H5NH2, C2H5NH2, C6H5NHCH3

(b) Aniline + CHCI3+KOH→Alkylisocyanate(strongsmellingsubstance) N, N-dimethylaniline + CHCI3+KOH→ No reaction (c) C2H5NH2<C6H5NHCH3<C6H5NH2

(b) Aniline + $C H C I_{3} + K O H \to A l k y l i s o c y a n a t e (s t r o n g s m e l l i n g s u b s t a n c e)$

N, N-dimethylaniline + $C H C I_{3} + K O H \to$ No reaction

(c) $C_{2} H_{5} N H_{2} < C_{6} H_{5} N H C H_{3} < C_{6} H_{5} N H_{2}$