Question

The starting material used in Sandmeyer's reaction is ___________.

• A. phenol
• B. haloarene
• C. haloalkene
• D. benzenediazonium chloride

Answer 1

The correct option is D benzenediazonium chloride

The starting material used in Sandmeyer's reaction is benzenediazonium chloride. Sandmeyer's reaction involves conversion of benzene diazonium chloride to chlorobenzene or bromobenzene. Diazonium group is replaced by $-Cl$ or $-Br$ group using cuprous salts. The reagent used in the conversion of benzene diazonium chloride to chlorobenzene is $C{u}_{2}C{l}_2$. The reagent used in the conversion of benzene diazonium
chloride to bromobenzene is $C{u}_{2}B{r}_2$.
$Ph-N_{2}Cl\stackrel{C{u}_{2}C{l}_2}{\to }Ph-Cl+N_2\uparrow$