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What is used for the production if dyes and isocyanates?

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What is used for the production if dyes and isocyanates?

(a) Nitrotoluenes

(b) Toluene

(c) Phenol

(d) Amines

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I'd like to ask this question from Preparations in division Nitration of Unit Processes

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The correct choice is (a) Nitrotoluenes

To explain I would say: The nitrotoluenes are used primarily as intermediates in the dye industry and the toluene diamines derived from dinitrotoluenes are used as intermediates for the production of isocyanates.

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