MHT CET · Chemistry · Haloalkanes and Haloarenes
Which alkyl halide has highest bond enthalpy of \(\mathrm{C}-\mathrm{X}\) bond?
- A \(\mathrm{CH}_3-\mathrm{Cl}\)
- B \(\mathrm{CH}_3-\mathrm{F}\)
- C \(\mathrm{CH}_3-\mathrm{Br}\)
- D \(\mathrm{CH}_3-\mathrm{I}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{CH}_3-\mathrm{F}\)
Step-by-step Solution
Detailed explanation
As the size of halogen increases from \(F\) to I , \(\mathrm{C}-\mathrm{X}\) bond length increases and \(\mathrm{C}-\mathrm{X}\) bond strength decreases. With decrease in bond strength, it becomes easier to break the bond by applying minimum energy.
\(\mathrm{C}-\mathrm{F}\) bond length is the shortest, so \(\mathrm{C}-\mathrm{F}\) bond strength is highest and \(\mathrm{CH}_3 \mathrm{~F}\) has the highest bond enthalpy.
\(\mathrm{C}-\mathrm{F}\) bond length is the shortest, so \(\mathrm{C}-\mathrm{F}\) bond strength is highest and \(\mathrm{CH}_3 \mathrm{~F}\) has the highest bond enthalpy.
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