Question

How many hydroxy groups are present in hydroxyquinol?

• A. $4$
• B. $1$
• C. $3$
• D. $2$

Hint:

Compounds ending with “triol” always contain three hydroxyl groups.

Answer 1

The Correct Option is C

Step 1: Structure of hydroxyquinol.
Hydroxyquinol is also known as benzene-1,2,4-triol. The term “triol” indicates the presence of three hydroxyl groups.

Step 2: Counting hydroxyl groups.
The benzene ring in hydroxyquinol contains three $\mathrm{-OH}$ groups attached at different positions.

Step 3: Conclusion.
Therefore, hydroxyquinol contains three hydroxy groups.