Arrange the following in order of decreasing dipole moment and give reason
CH₃Cl , CH₃F, CH₃Br , CH₃I

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Solution

CH3F > CH3I > CH3Br > CH3I
Fluorine is the most electronegative and therefore has the strongest dipole moment. As we move down the group electronegativites decrease and therefore strength of dipole moment also decreases.

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