The correct sequence of bond enthalpy of 'C—X' bond is :
CH_{3} - F < CH_{3} - Cl < CH_{3} - Br < CH_{3} - I
CH_{3} - F > CH_{3} - Cl > CH_{3} - Br > CH_{3} - I
CH_{3} - F < CH_{3} - Cl > CH_{3} - Br > CH_{3} - I
CH_{3} - Cl > CH_{3} - F > CH_{3} - Br > CH_{3} - I
The size of halogen atom increases from F to I hence bond length from C - F to C - I increases. Therefore, bond enthalpy from CH_{3} - F to CH_{3} - I decreases.
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