Chemical Process
Nylon 66 is so named because the

Number of nitrogen atoms between two carbon atoms are 6
Number of carbon atoms between two nitrogen atoms are 6
Average degree of polymerisation of the polymer is 1966
Polymer was first synthesised in 1966

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloroethane
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloromethane

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