Account for the following:
Aqueous solution of methyl amine reacts with iron (III) chloride to precipitate iron (III) hydroxide.

Write one chemical reaction to explain an acylation reaction.

Write one chemical reaction each to illustrate the following:
A coupling reaction of a diazonium salt.

Illustrate each of the following with an example of reaction:
Sandmeyer reaction.

180.

Illustrate  the following with an example of reaction:
Diazotization reaction.