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Chemistry Question on Bond Parameters

The correct sequence of bond enthalpy of ' C−XC - X' bond is:

A

CH3−F<CH3−Cl<CH3−Br<CH3−ICH _{3}- F < CH _{3}- Cl < CH _{3}- Br < CH _{3}- I

B

CH3−F>CH3−Cl>CH3−Br>CH3−ICH _{3}- F > CH _{3}- Cl > CH _{3}- Br > CH _{3}- I

C

CH3−F<CH3−Cl>CH3−Br>CH3−ICH _{3}- F < CH _{3}- Cl > CH _{3}- Br > CH _{3}- I

D

CH3−Cl>CH3−F>CH3−Br>CH3−ICH _{3}- Cl > CH _{3}- F > CH _{3}- Br > CH _{3}- I

Answer

CH3−F>CH3−Cl>CH3−Br>CH3−ICH _{3}- F > CH _{3}- Cl > CH _{3}- Br > CH _{3}- I

Explanation

Solution

Atomic size of F<Cl<Br<1F < Cl < Br <1 From R−FR - F to R−lR - l bond length increases where as bond enthalpy decreases