$-\text{CHO}$ has higher priority than $-\text{CO}-$.
Numbering from aldehyde: C1(-CHO), C2, C3(-CO-), C4(-CH₃)
$$\boxed{3\text{-oxobutanal}}$$
Back to NEET UG 2025 Organic Chemistry
NEET UG 2025 — Chemistry Organic Chemistry
medium
mcq
2025
Official previous-year question
Verified 30 May 2026.
Question
The IUPAC name of $\text{CH}_3\text{-CO-CH}_2\text{-CHO}$ is:
Options
- A
$3$-oxobutanal
- B
$4$-oxopentanal
- C
$2$-formylpropanone
- D
butane-$1,3$-dione
Solution
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