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(C) To show all three effects (inductive,mesomeric,and hyperconjugation),a compound must have: $1$. An electronegative atom or group (for inductive ef

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$4$

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(C) To show all three effects (inductive,mesomeric,and hyperconjugation),a compound must have: $1$. An electronegative atom or group (for inductive effect). $2$. $A$ conjugated system or lone pair (for mesomeric effect). $3$. An $\alpha$-hydrogen atom attached to an $sp^2$ hybridized carbon (for hyperconjugation). Let's analyze the given compounds: $1$. Anisole $(C_6H_5OCH_3)$: Shows inductive and mesomeric effects,but lacks $\alpha$-hydrogens on an $sp^2$ carbon for hyperconjugation. $2$. $5$-methylhex-$3$-en-$2$-one: Shows inductive,mesomeric (conjugation with carbonyl),and hyperconjugation (due to $\alpha$-hydrogens on the isopropyl group). $3$. Benzene: Shows only mesomeric effect (resonance). $4$. Chlorocyclohexane: Shows only inductive effect. $5$. $1$-isopropyl-$2$-nitrobenzene: Shows inductive,mesomeric (nitro group),and hyperconjugation (isopropyl group). $6$. $1$-(o-nitrophenyl)prop-$2$-ene: Shows inductive,mesomeric,and hyperconjugation. $7$. $m$-xylene: Shows inductive,hyperconjugation,but no mesomeric effect. $8$. $1$-acetyl-$2$-methylcyclohexene: Shows inductive,mesomeric,and hyperconjugation. The compounds that show all three effects are: $5$-methylhex-$3$-en-$2$-one,$1$-isopropyl-$2$-nitrobenzene,$1$-(o-nitrophenyl)prop-$2$-ene,and $1$-acetyl-$2$-methylcyclohexene. Total count = $4$.

How many compounds among the following compounds show inductive,mesomeric as well as hyperconjugation effects?

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