Chemistry Aldehydes & Ketones BUMHS 2024
PMDC Verified Question 9 of 94
The IUPAC name for formaldehyde is:
A
Ethanal
B
Methanal
C
Butanal
D
Proponal
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Official Correct Choice:
Option B: Methanal
Concept:

IUPAC nomenclature for aldehydes requires identifying the longest carbon chain containing the formyl group and changing the parent alkane suffix from "-e" to "-al".

Solution:

  • Formaldehyde has the chemical formula \( HCHO \).


  • The entire molecule consists of exactly 1 carbon atom.


  • The parent alkane with one carbon is methane.


  • Replacing the terminal 'e' with 'al' yields the systematic name Methanal.


Why other options are incorrect:

Ethanal contains 2 carbons (acetaldehyde). Propanal contains 3 carbons. Butanal contains 4 carbons.

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