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

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 D $C F_{3} - C F_{3}$
Fluorine is the most electro-negative element. Hence, it will try to pull the carbon towards itself which will result in increasing the bond length between two carbons.

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