Question:
Which from the following is NOT a monocarboxylic acid?
Which from the following is NOT a monocarboxylic acid?
Show Hint
Phthalic acid is benzene-1,2-dicarboxylic acid, with two COOH groups.
Updated On: Oct 1, 2026
- Toluic acid
- Acrylic acid
- Phthalic acid
- Isobutyric acid
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
A monocarboxylic acid has exactly one \(-\text{COOH}\) group.
Step 2: Check the Options:
Toluic acid: methylbenzoic acid, one COOH.
Acrylic acid: \(\text{CH}_2=\text{CH-COOH}\), one COOH.
Phthalic acid: benzene-1,2-dicarboxylic acid, two COOH.
Isobutyric acid: \((\text{CH}_3)_2\text{CH-COOH}\), one COOH.
Step 3: Conclusion:
Phthalic acid has two carboxyl groups, so it is a dicarboxylic acid and not a monocarboxylic acid.
Final Answer:
Phthalic acid is dicarboxylic, option (C). \[ \boxed{\text{(C) Phthalic acid}} \]
A monocarboxylic acid has exactly one \(-\text{COOH}\) group.
Step 2: Check the Options:
Toluic acid: methylbenzoic acid, one COOH.
Acrylic acid: \(\text{CH}_2=\text{CH-COOH}\), one COOH.
Phthalic acid: benzene-1,2-dicarboxylic acid, two COOH.
Isobutyric acid: \((\text{CH}_3)_2\text{CH-COOH}\), one COOH.
Step 3: Conclusion:
Phthalic acid has two carboxyl groups, so it is a dicarboxylic acid and not a monocarboxylic acid.
Final Answer:
Phthalic acid is dicarboxylic, option (C). \[ \boxed{\text{(C) Phthalic acid}} \]
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