Chemistry Aldehydes & Ketones MDCAT 2016
PMDC Verified Question 75 of 94
Which one of the following is IUPAC name of the structure \( H-C(=O)-H \)?
A
Propanaldehyde
B
Acetaldehyde
C
Methanone
D
Methanal
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Methanal
Concept:

In IUPAC nomenclature, aldehydes are named by replacing the terminal '-e' of the corresponding parent alkane with the suffix '-al'.

Solution:

  • The given structure \( H-C(=O)-H \) contains exactly one carbon atom.


  • The parent alkane with one carbon is methane.


  • Replacing the '-e' with '-al' yields Methanal.


Why other options are incorrect:

Acetaldehyde is the common name for ethanal (2 carbons). Methanone is chemically impossible because a ketone strictly requires a minimum of three carbon atoms (the carbonyl carbon must be flanked by two other carbons). Propanaldehyde has 3 carbons.

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