Question

Which of the following is formed when phenol is exposed to air?
a) 0-Benzoquinone
b)p-Benzoquinone
c) Phenoquinone
d) o- and p-Benzoquinone​

Answer 1

Answer:

c) Phenoquinone

Explanation:

Phenol slowly oxidises on exposure to air and turns pink in color. At first, quinone is formed which again reacts with phenol to form a polymerised product phenoquinone which is red in color.

Answer 2

Answer:

Phenoquinone is formed when phenol is exposed to air.

Explanation:

Phenols undergo oxidation to give different products under different reaction conditions.

When exposed to air and light, phenol gets oxidised to p-benzoquinone which combines with an excess of phenol to form a red coloured addition product called phenoquinone.

Thus, phenol develops a red or pink colour on standing for a long time due to the formation of phenoquinone.