Identify the reactivity order for halogens towards alkanes.

Identify the reactivity order for halogens towards alkanes.
  1. $\mathrm{I}_2\gt\mathrm{Br}_2\gt\mathrm{Cl}_2\gt\mathrm{F}_2$
  2. $\mathrm{Br}_2\gt\mathrm{Cl}_2\gt\mathrm{F}_2\gt\mathrm{I}_2$
  3. $\mathrm{F}_2\gt\mathrm{Cl}_2\gt\mathrm{Br}_2\gt\mathrm{I}_2$
  4. $\mathrm{Cl}_2\gt\mathrm{F}_2\gt\mathrm{Br}_2\gt\mathrm{I}_2$

Solution

Due to electronegativity difference, the reactivity order for halogens towards alkanes is: $\longleftarrow \frac{\mathrm{F}_2\gt\mathrm{Cl}_2\gt\mathrm{Br}_2\gt\mathrm{I}_2}{+\mathrm{I} \text { effect }}$

Asked in: MHT CET 2024 (16 May Shift 2)

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