Question

preparation of haloarenes

Answer 1

this preparation is from benzene diazonium chloride

Answer 2

Answer:

There are many ways some of them are:

From Hydrocarbon:

Alkane:

This uses free radical halogenation and the major favored products are 3 degree due to greater stability but probability of hitting other carbon is also a factor.

R-H + Cl2 + Uv\heat $\longrightarrow$ R-X

Alkene:

By Markonikov and Antimarkonikov addition

Aromatic derivatives:

Electrophilic substitution with Fe in dark

From alcohols (-OH):

• 3R-OH + P-X3 $\longrightarrow$ 3R-X + H3PO3
• R-OH + SOCl2 $\longrightarrow$R-Cl +SO2+HCl

By Halogen Exchange :

• Finkelstien's reaction
• Swarts reaction

By Amines:

Sandmeyer's reaction