The gas released during the Bhopal tragedy in 1984 was Methyl isocyanate.
The Bhopal disaster is also known as the Bhopal gas tragedy. There was a gas leak incident on the night of 2nd and 3rd December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, India. It is one of the world’s worst industrial disasters. More than 500,000 people were exposed to methyl isocyanate (MIC) gas. The chemical process employed in the Bhopal plant had methylamine reacting with phosgene to form MIC, which was then reacted with 1-naphthol to form the final product, carbaryl.