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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density in the benzene ring.Electron-donating grou

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$IV < I < II < III$

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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density in the benzene ring.Electron-donating groups $(EDG)$ increase the electron density and reactivity,while electron-withdrawing groups $(EWG)$ decrease it.$(I)$ Benzene: Reference compound.$(II)$ Toluene: The $-CH_3$ group is an electron-donating group due to the $+I$ effect and hyperconjugation,making it more reactive than benzene.$(III)$ Anisole: The $-OCH_3$ group is a strong electron-donating group due to the $+M$ (mesomeric) effect,making it the most reactive.$(IV)$ Benzaldehyde: The $-CHO$ group is a strong electron-withdrawing group due to the $-M$ effect,making it the least reactive.Thus,the increasing order of reactivity is: $(IV) < (I) < (II) < (III)$.

Arrange the following compounds in the increasing order of their reactivity towards electrophilic aromatic substitution:
$(I)$ Benzene
$(II)$ Toluene $(C_6H_5CH_3)$
$(III)$ Anisole $(C_6H_5OCH_3)$
$(IV)$ Benzaldehyde $(C_6H_5CHO)$

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Arrange the following compounds in the increasing order of their reactivity towards electrophilic aromatic substitution:$(I)$ Benzene$(II)$ Toluene $(C_6H_5CH_3)$$(III)$ Anisole $(C_6H_5OCH_3)$$(IV)$ Benzaldehyde $(C_6H_5CHO)$