Environmental Aspect
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
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About This Question
- Subject
- chemistry
- Chapter
- halogen organics
- Topic
- environmental aspect
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
React with phosgene forming harmless diethyl carbonate
- Oxidation: In the presence of light and air, Chloroform (CHCl3) is slowly oxidized to a poisonous gas called Phosgene (Carbonyl chloride, COCl2).
- Prevention: To prevent poisoning, about 1% Ethanol is added to chloroform bottles.
- Scavenging: If any phosgene is formed, it reacts immediately with ethanol to form Diethyl carbonate, which is non-poisonous.
- Darkness: For the same reason, chloroform is stored in dark, amber-colored bottles filled to the brim to exclude air.
This hard difficulty chemistry question is from the chapter halogen organics, covering the topic of environmental aspect. It appeared in the 2025 exam.
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