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Which of the following is the correct order of reactivity of haloalkanes towards

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Question: Which of the following is the correct order of reactivity of haloalkanes towards nucleophilic substitution? (2021)

Options:

  1. R-I > R-Br > R-Cl > R-F
  2. R-F > R-Cl > R-Br > R-I
  3. R-Cl > R-Br > R-I > R-F
  4. R-Br > R-I > R-Cl > R-F

Correct Answer: R-I > R-Br > R-Cl > R-F

Exam Year: 2021

Solution: 

The reactivity of haloalkanes towards nucleophilic substitution is primarily determined by the bond strength of the carbon-halogen bond. Iodine has the weakest bond, making R-I the most reactive, followed by R-Br, R-Cl, and R-F.

Which of the following is the correct order of reactivity of haloalkanes towards

Practice Questions

Q1
Which of the following is the correct order of reactivity of haloalkanes towards nucleophilic substitution? (2021)
  1. R-I > R-Br > R-Cl > R-F
  2. R-F > R-Cl > R-Br > R-I
  3. R-Cl > R-Br > R-I > R-F
  4. R-Br > R-I > R-Cl > R-F

Questions & Step-by-Step Solutions

Which of the following is the correct order of reactivity of haloalkanes towards nucleophilic substitution? (2021)
  • Step 1: Understand what haloalkanes are. They are organic compounds that contain carbon, hydrogen, and halogen atoms (like iodine, bromine, chlorine, or fluorine).
  • Step 2: Know that nucleophilic substitution is a reaction where a nucleophile (a species that donates an electron pair) replaces a halogen in a haloalkane.
  • Step 3: Recognize that the reactivity of haloalkanes in this reaction depends on the strength of the bond between the carbon atom and the halogen atom.
  • Step 4: Learn that the bond strength decreases as you go from fluorine to iodine. This means that the carbon-iodine bond is the weakest, making it easier for the nucleophile to replace the iodine.
  • Step 5: List the haloalkanes in order of reactivity based on bond strength: R-I (most reactive), R-Br, R-Cl, and R-F (least reactive).
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