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Question
Which of the following cannot be prepared by Sandmeyer’s reaction?
(i) Chlorobenzene
(ii) Bromobenzene
(iii) Iodobenzene
(iv) Fluorobenzene
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Solution
(iii) Iodobenzene
(iv) Fluorobenzene
Explanation:
Chloro and bromo arenes are easily prepared by Sandmeyer’s reaction. Iodoarenes are prepared by simply warming the diazonium salt solution with aqueous KI solution.
Fluoroarenes are prepared by Balz-Schiemann reaction.
All other reagents give aniline.
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