Resonance
Which of the following shows resonance?
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About This Question
- Subject
- chemistry
- Chapter
- some basic principles of organic chemistry
- Topic
- resonance
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
CH₂=CH-CHO
Resonance occurs in molecules with a conjugated system (alternating single and double bonds, or lone pair adjacent to a double bond).
- CH₂=CH-CHO (Acrolein): Has the structure CH2=CH−C(=O)H. The π electrons of the C=C double bond and the C=O double bond are separated by exactly one single bond, creating a conjugated system where electrons can delocalize.
- Propane and Ethanol have only single bonds. Propene (CH2=CH−CH3) has an isolated double bond but lacks conjugation.
This easy difficulty chemistry question is from the chapter some basic principles of organic chemistry, covering the topic of resonance. It appeared in the 2025 exam.
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