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(A) The reactivity of an aromatic ring towards an electrophilic substitution reaction depends on the electron density of the ring.$1$. Phenol $(d)$: T

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$d > b > a > c$

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(A) The reactivity of an aromatic ring towards an electrophilic substitution reaction depends on the electron density of the ring.$1$. Phenol $(d)$: The $-OH$ group is a strongly activating group due to its strong $+M$ (mesomeric) effect,which significantly increases the electron density on the ring.$2$. Toluene $(b)$: The $-CH_3$ group is an activating group due to $+I$ (inductive) effect and hyperconjugation,which increases the electron density on the ring,but less than the $-OH$ group.$3$. Benzene $(a)$: This is the reference compound with no substituents.$4$. Chlorobenzene $(c)$: The $-Cl$ group is a deactivating group due to its strong $-I$ effect,which outweighs its $+M$ effect,thereby decreasing the electron density on the ring.Therefore,the order of decreasing reactivity is $d > b > a > c$.

The order of decreasing reactivity towards an electrophilic reagent,for the following would be:
$a$. Benzene
$b$. Toluene
$c$. Chlorobenzene
$d$. Phenol

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The order of decreasing reactivity towards an electrophilic reagent,for the following would be:$a$. Benzene$b$. Toluene$c$. Chlorobenzene$d$. Phenol