Pick out the wrong statement ?

A. Chloral is obtained by the chlorination of ethyl alcohol

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

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

D. Benzene hexachloride is not a contact insecticide

E. oleum, which is a highly exothermic reaction

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