Home › MHT-CET › Chemistry › Halogen Derivatives › **Sandmeyer's reaction** prepares aryl halides f…
**Sandmeyer's reaction** prepares aryl halides from:
AAryl alcohols + HX
BAryl diazonium salts (Ar-N₂⁺) + CuX
CDirect halogenation
DAldol condensation
Answer & Solution
Correct answer: B. Aryl diazonium salts (Ar-N₂⁺) + CuX
Sandmeyer: ArN₂⁺X⁻ + CuX ⟶ Ar-X + N₂ + CuX. Diazonium salt (from aromatic amine + HNO₂) is decomposed in presence of Cu(I) halide. Especially useful for fluorides (Balz-Schiemann variant) where direct halogenation fails.
Related questions
When (R)-2-bromobutane reacts with NaOH via the **S$_N$2** mechanism, the product is:**Grignard reagent** R-Mg-X is formed by reacting:Aryl halides are far **less reactive** than alkyl halides toward nucleophilic substitutionAmong para-, meta-, ortho-dichlorobenzene, the **melting point** is highest for:**Aryl halides are prepared** by direct halogenation of arenes with which catalyst?The **IUPAC name** of (CH₃)₃C-Br (tert-butyl bromide) is:Addition of HBr to propene **without peroxide** gives mainly:**Swartz reaction** prepares: