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(B) To determine which compound exhibits all three effects (mesomeric,hyperconjugation,and inductive),let us analyze the options:$A$. Anisole $(C_6H_5

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p-Methylacetophenone

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(B) To determine which compound exhibits all three effects (mesomeric,hyperconjugation,and inductive),let us analyze the options:$A$. Anisole $(C_6H_5OCH_3)$: It shows a mesomeric effect $(+M)$ due to the lone pairs on oxygen,and an inductive effect $(-I)$ due to the electronegative oxygen atom. However,it lacks an $\alpha$-hydrogen on a carbon directly attached to the benzene ring,so it does not show hyperconjugation.$B$. $p$-Methylacetophenone $(CH_3-C_6H_4-COCH_3)$: $1$. Mesomeric effect ($+M$ or $-M$): The acetyl group $(-COCH_3)$ shows a $-M$ effect,and the methyl group $(-CH_3)$ shows a $+M$ effect (via hyperconjugation).$2$. Hyperconjugation: The methyl group attached to the benzene ring has three $\alpha$-hydrogens,allowing for hyperconjugation.$3$. Inductive effect: The methyl group shows a $+I$ effect,and the carbonyl group shows a $-I$ effect.Thus,$p$-methylacetophenone exhibits all three effects.$C$. Mesitylene: Shows hyperconjugation and inductive effects,but lacks a strong mesomeric group attached to the ring.$D$. tert-Butyl formate: Lacks the conjugated system required for significant mesomeric effects in the context of aromatic substitution.Therefore,the correct option is $B$.

In which of the following organic compounds are all effects (i.e.,mesomeric effect,hyperconjugation effect,and inductive effect) present?

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