Pick out the wrong statement ?

A. Insecticides acting on the insects through the respiratory system are called fumigants

B. Chloral is obtained by the chlorination of ethyl alcohol

C. Benzene hexachloride is not a contact insecticide

D. DDT is manufactured by the condensation of chlorobenzene with chloral at 30C in presence

E. oleum, which is a highly exothermic reaction

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