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33. Phenol, when it first reacted with concentrated sulphuric acid and then with concentrated nitric acid, gives A)2,4,6-trinitrophenol B)o-nitrophenol C)p-nitrophenol D)nitrobenzene

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Solution

Correct answer - Option (A)


Explanation of correct option

1. When phenol is treated with concentrated sulphuric acid ConcH2SO4 to convert it to phenol-2,4-disulphonic acid.

2. When phenol-2,4-disulphonic acid is treated with ConcHNO3, it forms 2,4,6-trinitrophenol or picric acid.


Explanation of incorrect option

1. Phenol is treated with dilute nitric acid DilHNO3 to get ortho and para nitrophenol. Therefore options (B) and (C) are incorrect.


2. Nitrobenzene is formed by reducing phenol in the presence of zinc dust. Therefore (D) is incorrect.

Conclusive statement- Option (A) is correct.


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