Naming and Identifying Alkenes

This video tutorial covers the process of naming branched chain alkenes. It begins with an introduction to the topic and outlines five key rules for naming these compounds. The tutorial provides detailed examples, demonstrating how to identify the longest carbon chain, number the chain, and name branches in alphabetical order. It also explains how to handle multiple branches and symmetrical molecules. The video concludes with final examples and encourages viewers to practice naming alkenes on their own.

What is the first step in naming branched chain alkenes?

• Identify the branches

• Find the longest continuous chain containing the double bond

• Number the chain from the end farthest from the double bond

• Name the branches in alphabetical order

When numbering the carbon chain, from which end should you start?

• The end farthest from the double bond

• The end with the most branches

• The end closest to the double bond

• The end with the least branches

In the example of a molecule with five carbons and a double bond starting on carbon two, what is the correct name?

• Pent-1-ene

• Pent-2-ene

• Hex-2-ene

• But-2-ene

How do you name a branch with one carbon?

• Butyl

• Ethyl

• Propyl

• Methyl

What is the correct name for a molecule with a three-carbon chain, a double bond on carbon one, and a methyl group on carbon two?

• 1-Methylprop-2-ene

• 3-Methylprop-1-ene

• 2-Methylbut-1-ene

• 2-Methylprop-1-ene

When naming branched alkenes, how should branches be ordered?

• Alphabetically

• By the size of the molecule

• By the position of the branch on the chain

• By the number of carbons in the branch

In a molecule with six carbons and a double bond on carbon two, which branch should be named first: ethyl on carbon four or methyl on carbon two?

• Neither should be named

• Methyl on carbon two

• Ethyl on carbon four

• Both should be named together

What is the correct name for a molecule with a six-carbon chain, a double bond on carbon three, and three methyl branches on carbons two, two, and four?

• 1,2,3-Trimethylhex-3-ene

• 2,2,4-Trimethylhex-3-ene

• 2,4,4-Trimethylhex-3-ene

• 3,3,5-Trimethylhex-2-ene

Why is it important to number from the end closest to the double bond?

• To ensure the double bond has the lowest possible number

• To maximize the number of branches

• To minimize the numbers for the branches

• To ensure the longest chain is identified

In the final example, what is the base name of the molecule with a six-carbon chain and a double bond on carbon two?

• Hex-1-ene

• Hex-2-ene

• Hex-3-ene

• Hex-4-ene