Question

To convert m-ethylaniline to m-ethylfluorobenzene, it should be treated with nitrous acid followed by _____________.

Answer 1

`NaBF_4`

Step-by-step explanation:

In this reaction, we must exchange the amino group (
`NH_2`) for a fluorine atom (
`F`). Also, the first step in this reaction is the addition of nitrous acid.

We must remember that the amino group in the presence of nitrous acid produces a diazonium salt. The
`N_2` group is a very good leaving group and many benzene derivatives can be produced from this intermediate (see figure 1).

If what we want is to bond a fluorine atom we must use
`NaBF_4` to be able to produce m-ethylfluorobenzene (see figure 2).

I hope it helps!