Question:
Chloroform reacts with oxygen in the presence of light to give
Chloroform reacts with oxygen in the presence of light to give
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Always associate Chloroform + Oxygen + Light with the poisonous gas Phosgene. In exam options, look for "Phosgene" or its IUPAC name "Carbonyl Chloride".
Updated On: May 6, 2026
- carbon tetrachloride
- carbonyl chloride
- methyl chloride
- methylene dichloride
- acetaldehyde
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The Correct Option is B
Solution and Explanation
Concept: Chloroform ($CHCl_3$) is susceptible to slow oxidation by atmospheric oxygen when exposed to light, a process known as photo-oxidation.
• Phosgene: The product formed, carbonyl chloride ($COCl_2$), is a highly poisonous gas commonly known as phosgene.
• Storage: To prevent this, chloroform is stored in dark-colored, airtight bottles, and often 1% ethanol is added to convert any formed phosgene into harmless diethyl carbonate.
Step 1: Write the chemical equation. The reaction is: \[ 2CHCl_3 + O_2 \xrightarrow{light} 2COCl_2 + 2HCl \]
Step 2: Identify the IUPAC name of the product. The molecule $O=CCl_2$ consists of a carbonyl group ($C=O$) with two chlorine atoms. Its IUPAC name is carbonyl chloride.
• Phosgene: The product formed, carbonyl chloride ($COCl_2$), is a highly poisonous gas commonly known as phosgene.
• Storage: To prevent this, chloroform is stored in dark-colored, airtight bottles, and often 1% ethanol is added to convert any formed phosgene into harmless diethyl carbonate.
Step 1: Write the chemical equation. The reaction is: \[ 2CHCl_3 + O_2 \xrightarrow{light} 2COCl_2 + 2HCl \]
Step 2: Identify the IUPAC name of the product. The molecule $O=CCl_2$ consists of a carbonyl group ($C=O$) with two chlorine atoms. Its IUPAC name is carbonyl chloride.
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