Chemistry - CHEMICAL BONDING Question with Solution | TestHub

In C₂F₆, the highly electronegative fluorine atoms strongly pull electron density away from the carbon atoms via the $-I$ effect. This electron withdrawal gives both carbon atoms a partial positive charge (${\delta }^{+}$), leading to a stronger electrostatic attraction that pulls the two nuclei closer together. Consequently, the C–C bond length in C₂F₆ decreases, making it shorter than the standard single bond length in C₂H₆. Therefore, the correct decreasing order of C–C bond length is C₂H₆ > C₂F₆.