Question

Which among the following is NOT dicarboxylic acid?

• A. Adipic acid
• B. Glutaric acid
• C. Valeric acid
• D. Malonic acid

Hint:

Use the mnemonic "Oh My Such Good Apple Pie" for dicarboxylic acids: Oxalic (2C), Malonic (3C), Succinic (4C), Glutaric (5C), Adipic (6C), Pimelic (7C).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
A dicarboxylic acid is an organic compound that contains exactly two carboxyl ($-\text{COOH}$) functional groups. We must map the common names provided in the options to their chemical structures to identify the exception.
Step 2: Key Formula or Approach:
Approach: Recall the chemical structures or IUPAC names for the common carboxylic acids listed in the options.
Step 3: Detailed Explanation:
Let's analyze the structure of each acid: - (A) Adipic acid: Its systematic IUPAC name is hexanedioic acid. Chemical Formula: $\text{HOOC}-(\text{CH}_2)_4-\text{COOH}$. It clearly contains two carboxyl groups, making it a dicarboxylic acid. - (B) Glutaric acid: Its systematic IUPAC name is pentanedioic acid. Chemical Formula: $\text{HOOC}-(\text{CH}_2)_3-\text{COOH}$. It contains two carboxyl groups and is a dicarboxylic acid. - (C) Valeric acid: Its systematic IUPAC name is pentanoic acid. Chemical Formula: $\text{CH}_3-(\text{CH}_2)_3-\text{COOH}$. It contains only one carboxyl group at the terminal end, making it a monocarboxylic acid. - (D) Malonic acid: Its systematic IUPAC name is propanedioic acid. Chemical Formula: $\text{HOOC}-\text{CH}_2-\text{COOH}$. It contains two carboxyl groups and is a dicarboxylic acid.
Step 4: Final Answer:
Valeric acid is a monocarboxylic acid and is NOT a dicarboxylic acid.