Question:

Study the reaction scheme shown below and identify the reactants A, B and C. 

 

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The conversion of Ethanol to Ethene is a Dehydration reaction, while the conversion of Ethanol to Ethyl Acetate is called Esterification!
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Solution and Explanation

Reactant A: Concentrated Sulphuric Acid (H_2SO_4) at 170°C. It acts as a dehydrating agent to convert ethanol into ethene.

Reactant B: Acetic Acid (CH_3COOH). Ethanol is oxidized to acetic acid, which then reacts with more ethanol (in the presence of an acid catalyst) to form Ethyl acetate (esterification).

Reactant C: Oxygen (O_2) or an Oxidizing agent. This facilitates the conversion of Ethanol to B (Acetic acid) or the combustion of Ethanol/Ethene to CO_2 and water.

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