Which of the following haloarenes is most reactive towards nucleophilic substitu

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Question: Which of the following haloarenes is most reactive towards nucleophilic substitution?

Options:

Correct Answer: Iodobenzene

Solution:

Iodobenzene is the most reactive towards nucleophilic substitution due to the weaker C-I bond compared to the other haloarenes.

Which of the following haloarenes is most reactive towards nucleophilic substitution?

Which of the following haloarenes is most reactive towards nucleophilic substitution?

Step 1: Understand what haloarenes are. Haloarenes are aromatic compounds that contain a halogen atom (like iodine, bromine, or chlorine) attached to a benzene ring.
Step 2: Know what nucleophilic substitution means. Nucleophilic substitution is a reaction where a nucleophile (a species that donates an electron pair) replaces a leaving group (like a halogen) in a compound.
Step 3: Identify the haloarenes in the question. The haloarenes mentioned are iodobenzene, bromobenzene, and chlorobenzene.
Step 4: Compare the C-X bonds (where X is the halogen) in these haloarenes. Iodobenzene has a C-I bond, bromobenzene has a C-Br bond, and chlorobenzene has a C-Cl bond.
Step 5: Understand bond strength. The C-I bond is weaker than the C-Br and C-Cl bonds. This means it is easier to break the C-I bond.
Step 6: Conclude that since the C-I bond is weaker, iodobenzene will react more easily in nucleophilic substitution compared to bromobenzene and chlorobenzene.
Step 7: Therefore, iodobenzene is the most reactive haloarene towards nucleophilic substitution.

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