Question

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

Answer 1

Correct answer - Option (A)

Explanation of correct option

1. When phenol is treated with concentrated sulphuric acid $ConcH{}_{2}SO{}_4$ to convert it to phenol-2,4-disulphonic acid.

2. When phenol-2,4-disulphonic acid is treated with $ConcHNO{}_3$, it forms 2,4,6-trinitrophenol or picric acid.

Explanation of incorrect option

1. Phenol is treated with dilute nitric acid $DilHNO{}_3$ 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.