Read the passage carefully and answer the questions.

Many halogen containing organic compounds are present in nature and some of them are clinically useful. These classes of organic compounds find a wide range of applications in our daily life as well as in industries. Many of the polyhalogen compounds are useful too in agriculture. However, some of these compounds cannot be easily decomposed and are thus considered to be environmental hazards. These halo compounds are prepared via different synthetic routes where a variety of organic compounds can be used as substrates such as amines, hydrocarbons etc. They are used as solvents for relatively non-polar compounds. These compounds exhibit substitution and elimination reactions, in addition to their reactions with different metals, which leads to the formation of a versatile starting material for others organic compounds.

Chloroform when slowly oxidized by air in the presence of light releases.

Phosgene

The correct answer is Option (2) → Phosgene

Chloroform is slowly oxidised by air in the presence of light to an extremely poisonous gas, carbonyl chloride, also known as phosgene. It is therefore stored in closed dark-coloured bottles completely filled so that air is kept out.

$ 2\text{CHCl}_3+\text{O}_2\xrightarrow{\text{light}}2\text{COCl}_2+2\text{HCl} $