Which of the following is the correct order of reactivity of haloalkanes in nucl

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Question: Which of the following is the correct order of reactivity of haloalkanes in nucleophilic substitution reactions? (2023)

Options:

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

Exam Year: 2023

Solution:

The reactivity of haloalkanes in nucleophilic substitution reactions decreases in the order R-I > R-Br > R-Cl > R-F due to bond strength.

Which of the following is the correct order of reactivity of haloalkanes in nucleophilic substitution reactions? (2023)

Which of the following is the correct order of reactivity of haloalkanes in nucleophilic substitution reactions? (2023)

Step 1: Understand what haloalkanes are. Haloalkanes are organic compounds that contain carbon, hydrogen, and halogen atoms (like iodine, bromine, chlorine, and fluorine).
Step 2: Know what nucleophilic substitution reactions are. In these reactions, a nucleophile (a species that donates an electron pair) replaces a halogen atom in the haloalkane.
Step 3: Recognize the halogens in order of reactivity. The halogens are iodine (I), bromine (Br), chlorine (Cl), and fluorine (F).
Step 4: Learn about bond strength. The bond strength between the carbon atom and the halogen affects how easily the halogen can be replaced in a reaction.
Step 5: Identify the bond strengths. The bond strength decreases in the order: C-F > C-Cl > C-Br > C-I. This means that the C-I bond is the weakest and breaks more easily.
Step 6: Conclude the order of reactivity. Since the weakest bond breaks more easily, the order of reactivity for nucleophilic substitution is R-I (most reactive) > R-Br > R-Cl > R-F (least reactive).

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