In which of the following cases $\mathrm{C}—\mathrm{C}$ bond length will be highest?

(a) ${\mathrm{CH}}_{3}—{\mathrm{CF}}_{3}$                               (b) ${\mathrm{FCH}}_{2}—{\mathrm{CH}}_{2}\mathrm{F}$

(c) ${\mathrm{F}}_{2}\mathrm{CH}$                                       (d) ${\mathrm{CF}}_{3}—{\mathrm{CF}}_{3}$

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