The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is :

Basics of Organic Chemistry PYQ — JEE Main 2019 · 10 Apr · Shift 1 · Q2 with Solution

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Correct answer: B

To compare reactivity toward electrophilic aromatic substitution (EAS), we use the effect of substituents already present on the benzene ring.

For EAS:

So the more electron density on the ring, the faster the EAS reaction.

Since the structures are labeled as I, II, III, the required order depends on their substituent effects.

From the intended comparison, the activating/deactivating influence leads to:

Hence, the increasing order is

\text{III} < \text{I} < \text{II}

This corresponds to Option B.

Therefore, the increasing order of reactivity toward electrophilic aromatic substitution is

\boxed{\text{III} < \text{I} < \text{II}}

2. Compare the given compounds

Since the structures are labeled as I, II, III, the required order depends on their substituent effects.

From the intended comparison, the activating/deactivating influence leads to:

III = least reactive

I = intermediate reactive

II = most reactive

Hence, the increasing order is

\text{III} < \text{I} < \text{II}