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(C) The dipole moment $(\mu)$ depends on both the electronegativity difference and the bond length between the carbon and the halogen atom. Although $

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$CH_3Cl$

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(C) The dipole moment $(\mu)$ depends on both the electronegativity difference and the bond length between the carbon and the halogen atom. Although $F$ is the most electronegative element,the $C-Cl$ bond length is significantly larger than the $C-F$ bond length,which results in a higher dipole moment for $CH_3Cl$ compared to $CH_3F$. The experimental order of dipole moments for methyl halides is: $\mu_{CH_3Cl} (1.86 \ D) > \mu_{CH_3F} (1.85 \ D) > \mu_{CH_3Br} (1.82 \ D) > \mu_{CH_3I} (1.64 \ D)$. Therefore,$CH_3Cl$ has the highest dipole moment.

Which one of the following has the highest dipole moment?

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