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# Which of the following chemicals are used to prepare MIC which caused Bhopal gas tragedy?

$\begin {array} {1 1} (1)\;\text{Methyl amine} & \quad (11)\;\text{Phogene} \\ (111)\;\text{phospene} & \quad (1v)\;\text{Dimethylamine} \end {array}$

$\begin {array} {1 1} (A)\;(1) \: and \: (111) & \quad (B)\;(111) \: and \: (1v) \\ (C)\;(1) \: and (11) & \quad (D)\;(11) \: and \: (1v) \end {array}$

Methyl isocyanate is usually manufactured by the reaction of monomethylamine andphosgene. For large scale production, it is advantageous to combine these reactants at higher temperature in the gas phase. A mixture of methyl isocyanate and two moles of hydrogen chloride is formed, but N-methylcarbamoyl chloride (MCC) forms as the mixture is condensed, leaving one mole of hydrogen chloride as a gas.
The methyl isocyanate is obtained by treating the MCC with a tertiary amine, such as N,N-dimethylaniline, or with pyridine or by separating it by using distillation techniques.
Ans : (C)