In which of the following cases C-C bond leng | vedclass

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(D) According to Bent's Rule,more electronegative substituents prefer to be attached to a hybrid orbital that has more $p-$character. As the number of

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$CF_3-CF_3$

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(D) According to Bent's Rule,more electronegative substituents prefer to be attached to a hybrid orbital that has more $p-$character. As the number of fluorine atoms increases on the carbon atoms,the $p-$character in the $C-C$ bond increases. Greater $p-$character in the hybrid orbitals forming the $C-C$ bond leads to a longer bond length. In $CH_3-CF_3$,the $C-C$ bond is formed by $sp^3-sp^3$ hybridization. In $CF_3-CF_3$,the $C-C$ bond has the highest $p-$character due to the presence of the most electronegative fluorine atoms,resulting in the longest $C-C$ bond length.

In which of the following cases $C-C$ bond length will be highest?

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