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Oxides of Sulphur

Picric acid i...

Question

Picric acid is a yellow coloured compound. Its chemical name is:

A

Trinitrobenzene

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B

2, 4, 6 - t r i n i t r o p h e n o l

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C

Trinitrotoluene

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D

Trinitroaniline

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Solution

The correct option is B $2, 4, 6 - t r i n i t r o p h e n o l$
Picric acid is 2,4,6-trinitrophenol. It is yellow crystalline solid. It is an explosive. Wet picric acid is used as a skin dye reacting with proteins in skin to give dark brown color.

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Q. Picric acid is a yellow coloured compound. Its IUPAC name is:

Q. Nowadays picric acid is prepared by treating phonel first with concentrated sulphuric acid which converts is to phenol -2,-4 disulphonoc acid, and then with concentrated nitric acid to get 2,4,6- trinitrophenol. Can you write the equations of the reactions involved?

Q. Which is stronger acid in the following pair?

2

-Nitrophenol and

2, 4, 6

-Trinitrophenol.

Q. How can coloured glass be obtained from molten glass? Name the chemical compounds to be added to molten glass to obtain the yellow coloured glass.

Q. Arrange the following compounds in increasing order of their acid strength.
Propan-1-ol, 2,4,6-trinitrophenol, 3-nitrophenol, 3, 5-dinitrophenol, phenol, 4- methyl phenol .

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