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  4. What will be the correct order of the C — F bond distance among the following? CHF3, CF4, CH3F and CH2F2

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Q. What will be the correct order of the $ C — F $ bond distance among the following?
$ CHF_3, CF_4, CH_3F $ and $ CH_2F_2 $

J & K CETJ & K CET 2017

Solution:

The correct order of the $C — F$ bond distance among the given compounds:
$CH_{3}F >\, CH_{2}F_{2} >\, CHF_{3}>\, CF_{4}$
With increase in number of fluorine atoms on the geminal carbon, the electrostatic interaction and thus, the bond strength between carbon and fluorine increases and thus, the bond length $(C — F)$ decreases