Given below are two statements:
Statement I : Picric acid is 2, 4, 6-trinitrotoluene.
Statement II : Phenol-2, 4-disulphuric acid is treated with conc. HNO3 to get picric acid.
In the light of the above statement, choose the most appropriate answer from the options given below:
Statement I : Picric acid is 2, 4, 6-trinitrotoluene.
Statement II : Phenol-2, 4-disulphuric acid is treated with conc. HNO3 to get picric acid.
In the light of the above statement, choose the most appropriate answer from the options given below:
- Statement I is incorrect but Statement II is correct.
- Both Statement I and Statement II are incorrect.
- Statement I is correct but Statement II is incorrect.
- Both Statement I and Statement II are correct.
The Correct Option is A
Approach Solution - 1
Statement I: Picric acid is 2, 4, 6-trinitrophenol, not 2, 4, 6-trinitrotoluene.
Statement II: Phenol-2, 4-disulphuric acid is treated with concentrated HNO$_3$ to produce picric acid.
Approach Solution -2
The question involves assessing the correctness of two statements related to the chemical compound 'picric acid'. Let's analyze both statements one by one:
- Statement I: Picric acid is 2, 4, 6-trinitrotoluene.
- 2, 4, 6-trinitrotoluene is actually known as TNT (trinitrotoluene), which is an explosive compound. Its structure is based on a benzene ring with methyl and nitro groups attached.
- However, picric acid is chemically known as 2, 4, 6-trinitrophenol, not 2, 4, 6-trinitrotoluene.
- Since picric acid and TNT have different chemical structures and names, Statement I is incorrect.
- Statement II: Phenol-2, 4-disulphuric acid is treated with conc. HNO3 to get picric acid.
- To synthesize picric acid, phenol can indeed undergo nitration. First, phenol is sulfonated to form phenol-2, 4-disulphonic acid.
- This intermediate is then nitrated with concentrated nitric acid (HNO3) to produce picric acid (2, 4, 6-trinitrophenol).
- Thus, Statement II is correct as it accurately describes the process of obtaining picric acid from phenol-2, 4-disulphonic acid.
Based on the examination of each statement:
- Statement I is incorrect because it confuses the chemical identity of picric acid with that of TNT.
- Statement II is correct because it accurately describes the chemical reaction used to produce picric acid.
Therefore, the most appropriate answer is: Statement I is incorrect but Statement II is correct.
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