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How is traces of tar and Sulphur removed from styrene?

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How is traces of tar and Sulphur removed from styrene?

(a) O-tertiary catechol

(b) P-tertiary catechol

(c) NaOH

(d) KOH

This question was posed to me in class test.

Question is from Synthetic Organic Chemical topic in division Synthetic Organic Chemical Industries of Chemical Technology

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Correct choice is (b) P-tertiary catechol

The best I can explain: The styrene which was stabilized with p-tertiary catechol is vacuumed distilled to remove traces of tar and Sulphur. The final overhead is refrigerated at 10 degree Celsius.

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