Q37 / 160 · AP EAMCET 2012 · Chemistry

Bond energy of $\mathrm{Cl}_2, \mathrm{Br}_2$ and $\mathrm{I}_2$ follow the order

  • Correct answer
    A
    $\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}_2$
  • B
    $\mathrm{Br}_2>\mathrm{Cl}_2>\mathrm{I}_2$
  • C
    $\mathrm{I}_2>\mathrm{Br}_2>\mathrm{Cl}_2$
  • D
    $\mathrm{I}_2>\mathrm{Cl}_2>\mathrm{Br}_2$

Solution

As the size of atom increases, $A-A$ bond length increases and hence, $A-A$ bond energy decreases. (where $A=\mathrm{Cl}, \mathrm{Br}, \mathrm{I})$ $\therefore$ The order of bond energy is $\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}_2$

Hence, the correct answer is option: 'A'.

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