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p -Block elements - ll — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
The correct sequence of bond enthalpy of $'\mathrm{C}-\mathrm{X}'$ bond is :
  • A
    $\mathrm{CH}_{3}-\mathrm{F}<\mathrm{CH}_{3}-\mathrm{Cl}<\mathrm{CH}_{3}-\mathrm{Br}<\mathrm{CH}_{3}-\mathrm{I}$
  • B
    $\mathrm{CH}_{3}-\mathrm{F}>\mathrm{CH}_{3}-\mathrm{Cl}>\mathrm{CH}_{3}-\mathrm{Br}>\mathrm{CH}_{3}-\mathrm{I}$
  • C
    $\mathrm{CH}_{3}-\mathrm{F}<\mathrm{CH}_{3}-\mathrm{Cl}>\mathrm{CH}_{3}-\mathrm{Br}>\mathrm{CH}_{3}-\mathrm{I}$
  • D
    $\mathrm{CH}_{3}-\mathrm{Cl}>\mathrm{CH}_{3}-\mathrm{F}>\mathrm{CH}_{3}-\mathrm{Br}>\mathrm{CH}_{3}-\mathrm{I}$
✓

Answer

Bond enthalpy of $C-X$ bond

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

Down the group with the increase in size of halogen in C-X bond, energy decreases.

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