Alkene Nomenclature and Isomerism

This video tutorial covers the nomenclature of alkenes, including the basics of naming alkenes with single and multiple double bonds, cycloalkenes, and the cis-trans and E-Z isomerism. It provides detailed examples and practice problems to help understand the naming conventions and stereochemistry of alkenes.

What is the correct name for an alkene with four carbon atoms and a double bond between the first and second carbon?

• 1-butene

• 2-butyne

• 1-butyne

• 2-butene

How would you name an alkene with a five-carbon chain and a double bond starting at the second carbon?

• 2-pentyne

• 3-pentene

• 3-pentyne

• 2-pentene

What suffix is used for an alkene with two double bonds?

• tetraene

• pentaene

• triene

• diene

How do you name a cyclic alkene with a double bond in a six-carbon ring?

• cyclohexatriene

• cyclohexene

• cyclohexane

• cyclohexadiene

In alkene nomenclature, which has higher priority: a double bond or a bromine substituent?

• Double bond

• Bromine

• Depends on the position

• They have equal priority

What is the term for isomers where substituents are on opposite sides of a double bond?

• Z isomer

• E isomer

• Trans isomer

• Cis isomer

Which system is used to name alkenes with complex substituents?

• E/Z system

• Common name system

• IUPAC system

• Cis-Trans system

When using the E/Z system, what determines the priority of substituents?

• Molecular weight

• Atomic number

• Position in the chain

• Number of bonds

What is the correct name for an alkene with a chlorine on the first carbon and a methyl group on the second carbon, using the E/Z system?

• 1-chloro-2-methylbutene

• 1-chloro-2-methylbutane

• Z-1-chloro-2-methylbutene

• E-1-chloro-2-methylbutene

In a molecule with multiple double bonds, how do you indicate the stereochemistry of each bond using the E/Z system?

• Use numbers before E/Z

• List all E/Z at the start

• Use numbers after E/Z

• No need to indicate