Chemistry Carboxylic Acids SZABMU 2024
PMDC Verified Question 4 of 94
The IUPAC name of Malonic acid \( \text{CH}_2(\text{COOH})_2 \) is —————.
A
1,2-Ethanedioic
B
1,4-Butanedioic acid
C
1,3-Propanedioic acid
D
1,6-Hexadecanoic acid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 1,3-Propanedioic acid
Concept:

Dicarboxylic acids are named in IUPAC by identifying the longest continuous carbon chain containing both carboxyl groups and appending "-dioic acid".

Formula:

$$ \text{HOOC-CH}_2\text{-COOH} $$

Solution:

  • Count the carbon atoms in the chain: one central \( \text{CH}_2 \) plus two \( \text{COOH} \) carbons gives a total of 3 carbon atoms.


  • The 3-carbon parent alkane is propane.


  • Appending the suffix for two acid groups gives propanedioic acid. Using locants (though technically redundant for this molecule), it is 1,3-propanedioic acid.


Why other options are incorrect:

Ethanedioic is oxalic acid (2 carbons). Butanedioic is succinic acid (4 carbons).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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