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

C H_{3} - C F_{3}

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F C H_{2} - C H_{2} F

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F_{2} - C H - C H F_{2}

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C F_{3} - C F_{3}

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Solution

The correct option is B $F C H_{2} - C H_{2} F$
In $F C H_{2} - C H_{2} F$ , the C-C bond length will be highest. It has a minimum number of F atoms. F atoms withdraw electron density from C-F bond. When, the number of F atoms is minimum, the electron density on C atom is maximum. Hence, the attraction of C atom for C-C bond pair of electrons is minimum. Hence, the C-C bond length is maximum.

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