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Polarity and Dipole Moments

In R-X the ...

Question

In $R - X$ the bond length is maximum in:

A

C - F

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B

C - C l

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C

C - B r

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D

C - I

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Solution

The correct option is A $C - I$
As we progress down the periodic table from fluorine to iodine, molecular size increases. As a result, we also see an increase in bond length. Conversely, as molecular size increases and we get longer bonds, the strength of those bonds decreases.

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