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 Question:
The question asks for the traditional common name of a dihydric phenol with hydroxyl (-OH) groups at the 1 and 3 positions (meta positions) on a benzene ring.

Step 2: Detailed Explanation:
Let's review the common names for the dihydroxybenzenes:
Benzene-1,2-diol (ortho positions): Commonly known as Catechol.
Benzene-1,3-diol (meta positions): Commonly known as Resorcinol.
Benzene-1,4-diol (para positions): Commonly known as Quinol or Hydroquinone.
Benzene-1,2,3-triol: A trihydric phenol, commonly known as Pyrogallol.
Therefore, Benzene-1,3-diol matches Resorcinol.

Step 3: Final Answer:
The common name is Resorcinol, matching option (b).