Question

How does phenol reacts with
a) Zinc dust b) Acetic anhydride c) benzene diazonium chloride d) Ammonia

Answer 1

a) phenol+zn(dust) -> benzene+ZnO

b)phenol+acid anhydride -> Ester

c)benzene + phenol ->Ester

diazonium chloride.

d)phenol +amonia --(ZnCl2/300°C)--> Aniline

Answer 2

Reactions of phenol

Explanation:

1.Reaction with Zinc dust

It reacts with zinc dust to form benzene and zinc oxide .

This reaction shows the acidic strength of phenols .

The reaction involved is :

C₆H₅OH+ Zn --> C₆H₆ + ZnO

2. Reaction with Acetic anhydride

Phenol undergoes reaction first with sodium hydroxide to form salicylic acid.Th ereaction is called as kolbe's reaction then it  which further reacts with acetic anhydride to form aspirin .

3. Reaction with benzne diazonium chloride

It reacts with benzene diazonium chloride to form azo dye that is chemically p-hydroxyazobenzene and in ornage in colour .The reaction is given below .

4.Reaction with ammonia

Phenol reacts with ammonia in presence of zinc chloride to form aniline .

The reaction is : C₆H₅OH +NH₃--------> C₆H₅NH₂

                                                   ZnCl₂