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Polarity and Dipole Moments

For the compo...

Question

For the compounds $C H_{3} C l, C H_{3} B r, C H_{3} I$ and $C H_{3} F$ , the correct order of increasing C-halogen bond length is:

C H_{3} F < C H_{3} C l < C H_{3} B r < C H_{3} I

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C H_{3} F < C H_{3} B r < C H_{3} C l < C H_{3} I

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C H_{3} F < C H_{3} I < C H_{3} B r < C H_{3} C l

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C H_{3} C l < C H_{3} B r < C H_{3} F < C H_{3} I

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Solution

The correct option is C $C H_{3} F < C H_{3} C l < C H_{3} B r < C H_{3} I$
$C$ -halogen bond length totally depends on the electronegativity difference between Carbon and halogen. The more the difference is, the less is the bond length. The electronegativity order of halogens is $I < B r < C l < F$ . Hence, the correct order of increasing $C$ -halogen bond length is $C H_{3} F < C H_{3} C l < C H_{3} B r < C H_{3} I$ .

Hence, the correct option is $(A)$

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