Chemical Process
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Tar neutralises the residual acids present in pitch
All of these
Its calorific value is very less

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Chemical Process
Nylon 66 is so named because the

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

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