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Stoichiometry

A mixture con...

Question

A mixture contains $4 -$ methylaniline, $2 -$ naphthol, $3 -$ chlorobenzoic acid and $1, 3 -$ dinitrobenzene.
The following scheme of separation is used to separate its constituents.
The correct statement(s) regarding the separation method is/are:

the reagents in Step

2

and Step

3

can be interchanged (i.e.

a q . N a O H

in Step

2

and

e q . N a H C O_{3}

in Step

3

)

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Y

in $3-chlorobenzoic acid

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W

and

Z

are

4 -

methylaniline and

1, 3 -

dinitrobenzene respectively

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if the original mixture also contains

4 -

aminobenzoic acid, it will be present in the filtrate of Step

1

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Solution

The correct options are
C $W$ and $Z$ are $4 -$ methylaniline and $1, 3 -$ dinitrobenzene respectively
D if the original mixture also contains $4 -$ aminobenzoic acid, it will be present in the filtrate of Step $1$ .
$W$ is water-insoluble 4−methylaniline, a base. It reacts with aq $H C l$ to form hydrochloride salt which is water soluble and goes into the filtrate. Neutralization with aq $N a O H$ regenerates free base 4−methylaniline.
$Z$ is 1,3−dinitrobenzene, a neutral compound. Hence, it neither dissolves in aq. $H C l$ , nor in aq. $N a H C O_{3}$ , nor in aq. $N a O H$ and is found in a final residue.
If the original mixture also contains $4 -$ aminobenzoic acid, it will be present in the filtrate of Step $1$ .
$4 -$ aminobenzoic acid will react with aq. $H C l$ to form hydrochloride salt which is water soluble and goes into the filtrate.

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× -

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A mixture contains 4−methylaniline, 2−naphthol, 3−chlorobenzoic acid and 1,3−dinitrobenzene.The following scheme of separation is used to separate its constituents.The correct statement(s) regarding the separation method is/are:

A mixture contains $4 -$ methylaniline, $2 -$ naphthol, $3 -$ chlorobenzoic acid and $1, 3 -$ dinitrobenzene.
The following scheme of separation is used to separate its constituents.
The correct statement(s) regarding the separation method is/are: