Which $C - X$ bond has the highest bond energy per mole?
a) $C - B r$
b) $C - C l$
c) $C - F$
d) $C - I$

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Solution

C is the correct answer.
Explanation: Bond energies depend on many factors: electron affinities, sizes of atoms involved in the bond, differences in their electronegativity, and the overall structure of the molecule. There is a general trend in that the shorter the bond length, the higher the bond energy.

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