The reaction which can be used to prepare aryl halides is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Sandmeyer's reaction
Aryl halides are commonly prepared from diazonium salts using Sandmeyer reaction.
General reaction: Ar–N₂⁺ + CuX → Ar–X + N₂
Where X = Cl, Br, CN
This allows substitution of diazonium group with halogen.
OTHER OPTIONS
- Aldol reaction: Used for forming β-hydroxy aldehydes/ketones from aldehydes/ketones (carbon-carbon bond formation).
- Kolbe's reaction: (Kolbe-Schmitt) Used for preparing salicylic acid (introduces –COOH on phenol).
- Reimer-Tiemann reaction: Used for introducing –CHO group (formyl) on ortho position of phenol.