Question

What is the common name of Benzene-1,3-diol?

• A. Catechol
• B. Resorcinol
• C. Quinol
• D. Pyrogallol

Hint:

Memorize the "C-R-Q" order for diols:
Catechol = 1,2 (Ortho)
Resorcinol = 1,3 (Meta)
Quinol = 1,4 (Para)

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Dihydric phenols (benzene rings with two $-OH$ groups) have specific common names based on the relative positions of the hydroxyl groups.

Step 2: Formula Application:
1. 1,2-diol (ortho): Catechol. 2. 1,3-diol (meta): Resorcinol. 3. 1,4-diol (para): Quinol (or Hydroquinone).

Step 3: Explanation:
Benzene-1,3-diol has the two hydroxyl groups in the meta position relative to each other. This specific isomer is known as Resorcinol.

Step 4: Final Answer:
The common name is Resorcinol.