Which of the following order regarding bond enthalpy $\varepsilon(C-X)$ in an alkyl halide (RX) is correct?

Which of the following order regarding bond enthalpy $\varepsilon(C-X)$ in an alkyl halide (RX) is correct?
  1. $\varepsilon(\mathrm{C}-\mathrm{Cl}) <\varepsilon(\mathrm{C}-\mathrm{Br}) <\varepsilon(\mathrm{C}-\mathrm{I})$
  2. $\varepsilon(\mathrm{C}-\mathrm{Cl})>\varepsilon(\mathrm{C}-\mathrm{Br})>\varepsilon(\mathrm{C}-\mathrm{I})$
  3. $\varepsilon(\mathrm{C}-\mathrm{Cl})>\varepsilon(\mathrm{C}-\mathrm{Br}) <\varepsilon(\mathrm{C}-\mathrm{I})$
  4. $\varepsilon(\mathrm{C}-\mathrm{Cl}) <\varepsilon(\mathrm{C}-\mathrm{Br})>\varepsilon(\mathrm{C}-\mathrm{I})$

Solution

Bond enthalpy $\mathrm{C}-\mathrm{X}$ (where $\mathrm{X}$ is $\mathrm{Cl}$, Br, I) decreases with increase in atomic number of $\mathrm{X}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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