Question

What is IUPAC name of the following compound?

• A. 3-Formyl-5-methylphenol
• B. 5-Formyl-3-methylphenol
• C. 3-Hydroxy-5-methylbenzaldehyde
• D. 5-Hydroxy-3-methylbenzaldehyde

Hint:

The aldehyde group has the highest priority, so the ring is named as a benzaldehyde with CHO at C-1.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Among the groups present (CHO, OH, methyl), the aldehyde has the highest priority. It is named as the suffix and the ring carbon holding it is C-1.

Step 2: Read the Structure
The benzene ring has CHO, OH and \(\text{CH}_3\) at alternate carbons, that is in meta positions to each other.

Step 3: Number the Ring
With CHO at C-1, the OH and methyl groups lie at C-3 and C-5.

Step 4: Name
Alphabetical order puts hydroxy before methyl, so the name is 3-hydroxy-5-methylbenzaldehyde.

Final Answer:
The compound is 3-hydroxy-5-methylbenzaldehyde. \[ \boxed{\text{(C) }\text{3-Hydroxy-5-methylbenzaldehyde}} \]