Which of the following has the strongest bond?
Correct answer: A. CH3 - F
- A. CH3 - F
- B. CH3 - I
- C. CH3 - Cl
- D. CH3 - Br
Explanation
This is because the strength of the bond between an alkyl halide and an amine is determined by the polarity of the bond, with more polar bonds being stronger. The polarity of a bond is determined by the difference in electronegativity between the two atoms involved in the bond. Fluorine has the highest electronegativity of all the halogens, making the C-F bond the most polar and, therefore, the strongest.
This question appeared on the NUMS 2019 (cancelled sitting) 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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