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Why is extraction of pyridine from coal tar or as a byproduct of coal gasification ineffective?

Why is extraction of pyridine from coal tar or as a byproduct of coal gasification ineffective? Correct Answer Less concentration of desired compound

The process was labor-consuming and inefficient because coal tar contains only about 0.1% pyridine, and therefore a multi-stage purification was required, which further reduced the output.

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