Reaction of phenol with which of the following reagents form picric acid?

1. Conc. $\mathrm{H}_2 \mathrm{SO}_4$
2. dil. $\mathrm{H}_2 \mathrm{SO}_4$
3. Conc. $\mathrm{HNO}_3$
4. dil. $\mathrm{HNO}_3$

Asked in: AP EAMCET 2023 (19 May Shift 1)

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