Question
Which of the following halogen derivative forms a poisonous phosgene, when come in contact with air and light?
MHT CET
Chemistry
Haloalkanes and Haloarenes
2026
MHT CET 2026 (15 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. CHCl _3
- B. PCl _3
- C. C _6 H _5 Cl
- D. CH _2 Cl _2
Answer
A. CHCl _3
Step-by-step solution
Chloroform ( CHCl _3) is slowly oxidized by oxygen in the presence of light to form a highly poisonous gas, carbonyl chloride, which is commonly known as phosgene. The chemical reaction is given by: 2 CHCl _3 + O _2 h 2 COCl _2 + 2 HCl Therefore, CHCl _3 forms poisonous phosgene when it comes in contact with air and light.
Related: Chemistry — Haloalkanes and Haloarenes · All PYQ Banks