Q3 / 160 · TS EAMCET 2011 · Chemistry

Phosgene is formed slowly from which one of the following on exposure to air and sunlight?

  • Correct answer
    A
    $\mathrm{CHCl}_3$
  • B
    $\mathrm{H}_3 \mathrm{CCl}$
  • C
    $\mathrm{H}_3 \mathrm{COH}$
  • D
    $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}$

Solution

In the presence of air and light, chloroform forms carbonyl chloride (also called phosgene) which is extremely poisonous. $\underset{\text { chloroform }}{\mathrm{CHCl}_3}+\frac{1}{2} \mathrm{O}_2 \stackrel{\text { Air and light }}{\longrightarrow} \underset{\text { phosgene }}{\mathrm{COCl}_2}+\mathrm{HCl}$

Hence, the correct answer is option: 'A'.

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