The dipole moment is the highest for

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(C) The dipole moments of the given compounds are as follows:$(i)$ $Trans-2-butene$: The dipole moment is $0$ due to the cancellation of bond dipoles.

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$Acetophenone$

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(C) The dipole moments of the given compounds are as follows:$(i)$ $Trans-2-butene$: The dipole moment is $0$ due to the cancellation of bond dipoles.$(ii)$ $1, 3-Dimethylbenzene$: It has a small dipole moment due to the inductive effect of the two methyl groups.$(iii)$ $Acetophenone$ $(C_6H_5COCH_3)$: It has a high dipole moment due to the strong electron-withdrawing nature of the carbonyl group $(C=O)$,which creates a significant charge separation.$(iv)$ $Ethanol$ $(C_2H_5OH)$: It has a moderate dipole moment due to the electronegativity difference between oxygen and hydrogen.Comparing these,$Acetophenone$ has the highest dipole moment among the given options.

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