Question 1

Which of the following best describes the structural feature that distinguishes alkenes from alkanes?

Accepted Answer

Alkenes contain at least one carbon-carbon double bond.

Question 2

What is the correct IUPAC name for the following compound: $$ \mathrm{CH_2=CHCH_2CH_3} $$?

Accepted Answer

1-butene

Question 3

A molecule has the condensed formula $$ \mathrm{CH_3CH=CHCH_2CH_3} . $$What is its correct IUPAC name?

Accepted Answer

2-pentene

Question 4

Which of the following is the correct name for a molecule with two double bonds at carbons 1 and 3 in a six-carbon chain?

Accepted Answer

1,3-hexadiene

Question 5

When naming an alkene with substituents, from which end should you begin numbering the carbon chain?

Accepted Answer

From the end closest to the double bond

Question 6

What is the correct IUPAC name for a molecule with the following features: an eight-carbon chain, double bonds at carbons 2 and 5, and no other substituents?

Accepted Answer

2,5-octadiene

Question 7

Which of the following best describes the difference between cis and trans geometric isomers in alkenes?

Accepted Answer

Cis isomers have substituents on the same side of the double bond; trans isomers have them on opposite sides.

Question 8

Which of the following molecules can exhibit cis-trans (geometric) isomerism?

Accepted Answer

$$\mathrm{CH_3CH=$$CHCH_3$$}$$

Question 9

Which of the following is the correct name for a six-membered ring with a double bond and a methyl group at carbon 3?

Accepted Answer

3-methyl-1-cyclohexene

Question 10

A compound is named trans-2-butene. Which of the following best describes its structure?

Accepted Answer

The two methyl groups are on opposite sides of the double bond.

Question 11

Which of the following statements about the physical properties of alkenes is correct?

Accepted Answer

Alkenes have relatively low melting and boiling points and are insoluble in water.

Question 12

Which of the following is the correct IUPAC name for a molecule with five carbons, a double bond starting at carbon 1, and an isopropyl group at carbon 3?

Accepted Answer

3-isopropyl-1-pentene

Question 13

Which of the following best explains why rotation around a double bond is restricted in alkenes?

Accepted Answer

The presence of a pi bond in the double bond prevents free rotation.

Question 14

A molecule is named 2,3-dichloro-2-pentene. Which of the following is its correct condensed formula?

Accepted Answer

$$\mathrm{CH_3CCl=$$CHCClCH_3$$}$$

Question 15

Which of the following is NOT a correct IUPAC name for an alkene?

Accepted Answer

2-methyl-2-butane

Question 16

Which of the following molecules cannot be classified as either cis or trans isomer?

Accepted Answer

An alkene with two identical groups on the same carbon of the double bond

Question 17

Which of the following is the correct name for a cyclic alkene with eight carbons, double bonds at positions 1 and 4, and a chlorine substituent at position 3?

Accepted Answer

3-chloro-1,4-cyclooctadiene

Question 18

Which of the following best describes a geometric isomer?

Accepted Answer

Molecules with the same molecular formula but different spatial arrangement around a double bond

Question 19

Which of the following is the correct IUPAC name for a molecule with four carbons, a double bond starting at carbon 2, and a methyl group at carbon 2?

Accepted Answer

2-methyl-2-butene

Alkenes: Structure, Nomenclature, and Isomerism

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