Question 1

The image shows a person using a welding torch. Based on your knowledge of organic chemistry, which unsaturated hydrocarbon is commonly used as a fuel in welding torches?

Accepted Answer

Ethyne

Question 2

Which of the following statements best explains why ethyne is suitable as a fuel for welding torches?

Accepted Answer

Ethyne contains a triple bond, which releases a large amount of energy upon combustion.

Question 3

Which general formula represents the class of hydrocarbons to which ethyne belongs?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n-2}$$

Question 4

Why are unsaturated hydrocarbons like ethyne and ethene more reactive than alkanes?

Accepted Answer

They contain multiple bonds, which are less stable than single bonds.

Question 5

Which type of chemical reaction is most commonly associated with the use of ethyne in welding?

Accepted Answer

Combustion reaction

Question 6

When ethyne is combusted in oxygen, which of the following products are formed?

Accepted Answer

Carbon dioxide and water

Question 7

Which of the following best describes the bonding in ethyne?

Accepted Answer

Each carbon atom forms a triple bond with another carbon atom and a single bond with hydrogen.

Question 8

Which of the following is a correct IUPAC name for a hydrocarbon with three carbon atoms and a triple bond?

Accepted Answer

Propyne

Question 9

In the context of industrial applications, why is the high temperature produced by the combustion of ethyne important for welding?

Accepted Answer

It allows for the melting of metals with high melting points.

Question 10

Which of the following best describes the term 'unsaturated hydrocarbon'?

Accepted Answer

A hydrocarbon with at least one double or triple bond between carbon atoms.

Lesson 1.2: Alkenes and Alkynes: Structure, Nomenclature, Isomerism, and Reactions

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