A) \[KCl\,.\,\,MgC{{l}_{2}}24{{H}_{2}}O\]
B) \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\,.\,\,n{{H}_{2}}O\]
C) \[C{{l}_{3}}CN{{O}_{2}}\]
D) \[{{K}_{4}}Fe{{(CN)}_{6}}\]
Correct Answer: C
Solution :
The composition of tear gas is \[C{{l}_{3}}CN{{O}_{2}}\]. It is formed when chloroform react with \[HN{{O}_{3}}\]. In this reaction nitration of chloroform takes place.
Note- Chloropicrin is also used as an insecticide.
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