(4) methyl isocyanate Explanation: The Bhopal disaster, also referred to as the Bhopal has tragedy, was a gas leak incident in India, considered one of the world's worst industrial disasters. It occurred on the night of 2-3 December, 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.