The compound has 4 carbons with aldehyde group at C1 and double bond at C2. IUPAC name: But-2-enal. Crotonaldehyde is common name.
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JEE Main 2023 — Chemistry Organic Chemistry
easy
mcq
2023
Official previous-year question
Verified 30 May 2026.
Question
Which of the following is the IUPAC name of CH₃-CH=CH-CHO?
Options
- ABut-2-enal
- BBut-3-enal
- CCrotonaldehyde
- DButanal
Solution
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