Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction:

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Given: The compounds differ by substituents that either donate or withdraw electron density from the aromatic ring during electrophilic aromatic substitution.

Find: The increasing order of rate of aromatic electrophilic substitution reaction.

Groups like $-\text{OH}$ and $-\text{NH}_2$ activate the aromatic ring by donating electron density, whereas $-\text{NO}_2$ and $-\text{COOH}$ deactivate it by withdrawing electron density.

Four aromatic fused-ring compounds labeled a, b, c and d, showing substituents such as OH and carbonyl with plus and minus resonance effects marked near ring positions.

Benzene becomes more reactive towards electrophilic aromatic substitution when an electron-donating group is attached to the benzene ring. Benzene with electron-withdrawing groups decreases the reactivity, as it deactivates the ring towards electrophilic attack.

Thus, the order is:

\text{(a) < (b) < (c)}

Therefore, the correct option is A.

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