Introduction to Alkenes

What is the general formula for alkenes?

• CnHn+2

• CnH2n

• CnH2n+2

• CnHn

How do you name an alkene with a double bond between carbon atoms?

• Use the Roman numeral system to name the alkene.

• Use the periodic table to name the alkene.

• Use the Greek alphabet to name the alkene.

• Use the IUPAC naming system to name the alkene.

In the IUPAC system, what is the suffix used for naming alkenes?

• -ene

• -ate

• -ine

• -yne

What is the name of the alkene with two carbon atoms and a double bond?

• methene

• ethene

• butene

• propene

How do you determine the parent chain in naming alkenes?

• Choose the chain with the most substituents

• Count the number of carbon atoms in the chain

• Select the chain with the highest molecular weight

• Select the longest continuous chain of carbon atoms that contains the double bond.

What is the name of the alkene with three carbon atoms and a double bond?

• methene

• butene

• ethene

• propene

What is the purpose of using cis-trans notation in naming alkenes?

• To show the presence of functional groups in alkenes.

• To indicate the number of carbon atoms in the alkene chain.

• To specify the spatial arrangement of substituents around a double bond in alkenes.

• To specify the color of alkenes.

How do you name a substituted alkene?

• Use Roman numerals to indicate the position of the substituent

• Ignore the presence of substituents

• Add prefixes to the alkene name based on the number of carbons

• Follow IUPAC naming rules for alkenes.

What is the difference between cis and trans isomers in alkenes?

• Trans isomers have similar groups on the same side of the double bond.

• Cis isomers have similar groups on opposite sides of the double bond.

• Cis isomers have similar groups on the same side of the double bond, while trans isomers have similar groups on opposite sides of the double bond.

• Cis isomers have different groups on the same side of the double bond.

What is the name of the alkene with four carbon atoms and a double bond?

• butene

• ethene

• pentene

• methene