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$(A)$ Electrophilic aromatic substitution is facilitated by electron-donating groups on the benzene ring.In the given compounds, the alkyl groups atta

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$I > II > III > IV$

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$(A)$ Electrophilic aromatic substitution is facilitated by electron-donating groups on the benzene ring.In the given compounds, the alkyl groups attached to the phenyl ring $(\phi)$ exhibit the $+I$ (inductive) effect and hyperconjugation.As the number of $\alpha$-hydrogens increases, the electron-donating ability via hyperconjugation increases, thereby increasing the electron density on the ring and the reactivity towards electrophiles.Number of $\alpha$-hydrogens:$I. \phi-CH_3$: $3 \ \alpha-H$$II. \phi-CH_2-CH_3$: $2 \ \alpha-H$$III. \phi-CH(CH_3)_2$: $1 \ \alpha-H$$IV. \phi-C(CH_3)_3$: $0 \ \alpha-H$Thus, the order of reactivity is $I > II > III > IV$.

The order of reactivity of the following compounds towards electrophilic substitution will be - [where $\phi = C_6H_5$]:
$I. \phi-CH_3$
$II. \phi-CH_2-CH_3$
$III. \phi-CH(CH_3)_2$
$IV. \phi-C(CH_3)_3$

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The order of reactivity of the following compounds towards electrophilic substitution will be - [where $\phi = C_6H_5$]:$I. \phi-CH_3$$II. \phi-CH_2-CH_3$$III. \phi-CH(CH_3)_2$$IV. \phi-C(CH_3)_3$