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(D) The dipole moment of $CH_3X$ molecules depends on the electronegativity difference between the carbon atom and the halogen atom $(X)$.As we move d

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$CH_3I$

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(D) The dipole moment of $CH_3X$ molecules depends on the electronegativity difference between the carbon atom and the halogen atom $(X)$.As we move down the group from $F$ to $I$,the electronegativity of the halogen decreases,which leads to a decrease in the $C-X$ bond polarity.Although the bond length increases down the group,the decrease in electronegativity is the dominant factor.Therefore,the dipole moment decreases in the order: $CH_3F > CH_3Cl > CH_3Br > CH_3I$.Thus,$CH_3I$ has the lowest dipole moment.

Which of the following molecules exhibits the lowest dipole moment?

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