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Solution


Q.

Given below are two statements:                                                                                        [2024]

Statement I: Picric acid is 2, 4, 6 - trinitrotoluene.
Statement II: Phenol - 2, 4 - disulphonic acid is treated with Conc. HNO3 to get picric acid.

In the light of the above statements, choose the most appropriate answer from the options given below:
1 Both Statement I and Statement II are incorrect  
2 Statement I is correct but Statement II is incorrect  
3 Both Statement I and Statement II are correct  
4 Statement I is incorrect but Statement II is correct  

Ans.

(4)

Picric acid is prepared by treating phenol first with concentrated sulphuric acid which converts it to phenol-2,4-disulphonic acid. Because of the –M effect of the –SO3H group, electron density on the ring decreases and hence ring is less prone to getting oxidized. Phenol-2,4-disulphonic acid is then treated with concentrated nitric acid to get 2, 4, 6-trinitrophenol.