Which of the following bonds has minimum bond energy?
Correct answer: C. C - I
- A. C - F
- B. C - Cl
- C. C - I
- D. C - Br
Explanation
C-I bond is the longest bond of all the options as atomic radius increases down the group, iodine is furthest down hence minimum bond energy would be for the weakest bond that is, C-I.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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