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The correct sequential order of the reagents for the given reaction is NO2-substituted benzene with NH2 group converted to OH-substituted benzene with I group as shown.

1. HNO2, Fe/H+, HNO2, KI, H2O/H+
2. HNO2, KI, Fe/H+, HNO2, H2O/warm
3. HNO2, KI, HNO2, Fe/H+, H2O/H+
4. HNO2, Fe/H+, KI, HNO2, H2O/warm

Correct answer: HNO2, Fe/H+, KI, HNO2, H2O/warm

Solution

The correct sequence begins with HNO2 to introduce a nitro group, followed by Fe/H+ to reduce it to an amine. Then, KI is used to perform a substitution, and finally, HNO2 and warm water facilitate the conversion to the desired hydroxylated product.

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