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Chapter 2: Problem 149

The product formed when ethene and air under pressure is passed over silver catalyst heated to \(500 \mathrm{~K}\) is (a) Epoxy ethane (b) Ethanal (c) Ethanoic acid (d) Methanal

Short Answer

Expert verified
Answer: Ethanal (b).

Step by step solution

01

Identify the reactants

In this reaction, the reactants are ethene (C2H4) and air, which mainly consists of oxygen. The catalyst used is silver, and the reaction occurs at a temperature of 500 K.
02

Recall and apply knowledge of ethene reactions

Ethene is an unsaturated hydrocarbon with a double bond. It can undergo a range of reactions, including addition, oxidation, and halogenation. In the presence of a catalyst and a suitable temperature, ethene can react with oxygen to form products.
03

Analyze the given options

Let's analyze each option and see if it can be formed as a product from the reaction of ethene and air: (a) Epoxy ethane: This is formed by the addition of oxygen to ethene. (b) Ethanal: This is formed by the partial oxidation of ethene. (c) Ethanoic acid: This is formed by the complete oxidation of ethene. (d) Methanal: This cannot be formed as a product from the ethene reaction since it contains only one carbon atom, while ethene has two carbon atoms.
04

Choose the correct product

Considering the reaction conditions (silver catalyst and 500 K temperature), the most probable product to form is the one from the partial oxidation of ethene. This option is (b) Ethanal. So, the product formed when ethene and air under pressure is passed over a silver catalyst heated to 500 K is Ethanal (b).

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