What Are Structural Isomers?

The video tutorial explains the concept of structural isomers, using alkanes like methane, ethane, propane, and butane as examples. It discusses how structural isomers have the same molecular formula but different structural arrangements. The tutorial also covers the history of lead-free petrol, highlighting the role of octane isomers in improving fuel efficiency. Finally, it explores the structural isomers of hexane, providing their formal names and emphasizing the importance of the longest carbon chain in naming isomers.

What are the first four alkanes mentioned in the video?

• Methane, Ethane, Butane, Hexane

• Methane, Ethane, Propane, Pentane

• Methane, Ethane, Propane, Butane

• Methane, Propane, Butane, Pentane

What is the structural isomer of butane called when it has a methyl group on the second carbon?

• 2-methyl propane

• 3-methyl butane

• 3-methyl propane

• 2-methyl butane

What was the main issue with early petrol engines that led to the use of isomers?

• Petrol burnt too slowly

• Petrol was too expensive

• Engines knocked or jolted

• Engines were too quiet

What is the formal name of the isomer of octane with a five-carbon chain and an ethyl group?

• 3-ethyl-2-methyl pentane

• 2,2-dimethyl pentane

• 3,3-methyl ethyl pentane

• 3-ethyl-3-methyl pentane

What toxic compound was released from car exhausts due to leaded petrol?

• Lead oxide

• Carbon monoxide

• Sulfur dioxide

• Nitrogen oxide

How many structural isomers of hexane are discussed in the video?

• Two

• Three

• Four

• Five

Which of the following is a structural isomer of hexane based on butane?

• 3,3-dimethylpentane

• 2-methylpentane

• 3-methylpentane

• 2,3-dimethylbutane