The correct sequence of bond enthalpy of the C-X bond is

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The correct sequence of bond enthalpy of the C-X bond is

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${CH}_{3} {- Cl > CH}_{3} {- F >CH}_{3} {- Br > CH}_{3} -I$

${CH}_{3} {-F < CH}_{3} {-Cl < CH}_{3} {-Br <CH}_{3} -I$

${CH}_{3} -F > {CH}_{3} -Cl > {CH}_{3} -Br > {CH}_{3} -I$

${CH}_{3} -F < {CH}_{3} -Br < {CH}_{3} -I < {CH}_{3} -Cl$

answer is C.

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Detailed Solution

With increase in size of the halogen atom, bond length gradually increases and bond enthalpy gradually decreases.
Hence, the order of bond enthalpy of $C-X$ bond is
$H_{3} {C - F > H}_{3} {C - Cl > H}_{3} {C - Br >H}_{3} C-I$
(2) Increasing order of C-X bond length

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