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NEET2002ChemistryHaloalkanes and HaloarenesActual

Reactivity order of halides for dehydrohalogenation is:

Options

  1. AR-F > R-Cl > R-Br > R-I
  2. BR-I > R-Br > R-Cl > R-F
  3. CR-I > R-Cl > R-Br > R-F
  4. DR-F > R-I > R- Br > R-Cl

Correct answer

B. R-I > R-Br > R-Cl > R-F

Step-by-step solution

The alkyl halides are very reactive due to highly polarized R - X bonds with a large difference in electronegativities of carbon and halogen atoms. Thus, reactivity of R - X depends on bond length.More be the bond length, easier for the R - X to go for dehydrohalogenation. Related Theory Halogens increase in reactivity from the bottom to the top of their Group.

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