Question

Starting from benzene or toluene or aniline and with the aid of diazonim salt synthesis the following : a. p-Nitrobenzene
b. p-Cyano benzoic acid
c. o-Bromotoluene
d. 1,3,5,-Tribromobenzene
e. m-Bromotoluene
f. m-Bromochlorobenzene
g. p-Iodotoluene .

Answer 1

Here, - `NH_2` is o- and p-directing , introduce on `(-NO_2)` group , directly by nitration aniline woluk yield mixture and tarry broducts , Introduce the secons `(NO_2)` group via diazonium salt method .

b. m
First introduce `(- No_2)` group at p-position and then oxidation of `(Me -)` group to `( - COOH)` and then introduce `(-CN)` group by Sandmeyer reaction.
` c.
e.