Which of the following are arranged in the decreasing order of dipole moment ?

C H_{3} C l, C H_{3} B r, C H_{3} F

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C H_{3} C l, C H_{3} F, C H_{3} B r

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C H_{3} B r, C H_{3} C l, C H_{3} F

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C H_{3} B r, C H_{3} F, C H_{3} C l

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Solution

The correct option is B $C H_{3} C l, C H_{3} F, C H_{3} B r$
The bond polarity will be in the order $F > C l > B r$ .
$F$ is a very small ion, which reples the bonds, decreasing the bond angle, order of polarity:
$C H_{3} C l, C H_{3} F, C H_{3} B r$

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