Question 1

Which of the following best describes an alkyne?

Accepted Answer

A hydrocarbon containing at least one carbon-carbon triple bond.

Question 2

What is the correct IUPAC name for the compound with the condensed formula $$\mathrm{CH_3C \equiv CCH_2CH_3}$$?

Accepted Answer

2-pentyne

Question 3

When naming an alkyne, from which end of the carbon chain should you begin numbering?

Accepted Answer

From the end closest to the triple bond.

Question 4

What is the geometry around each carbon atom involved in a triple bond in an alkyne?

Accepted Answer

Linear

Question 5

Which of the following is the correct name for the molecule with the structure $$\mathrm{CH_3C \equiv CCH_2CH_2CH_3}$$?

Accepted Answer

1-pentyne

Question 6

A molecule has the following structure: $$\mathrm{CH_3CH_2C \equiv CCH_2CH_3}. $$What is its IUPAC name?

Accepted Answer

3-hexyne

Question 7

Which of the following is the correct name for a seven-carbon alkyne with the triple bond starting at carbon 3?

Accepted Answer

3-heptyne

Question 8

What is the correct IUPAC name for a molecule with the following features: a six-carbon chain, a triple bond starting at carbon 1, a methyl group at carbon 5, a bromo group at carbon 4, and a chloro group at carbon 3?

Accepted Answer

4-bromo-3-chloro-5-methyl-1-hexyne

Question 9

Which of the following statements about alkynes is FALSE?

Accepted Answer

Alkynes can easily form stable cyclic structures.

Question 10

What is the correct name for the following molecule: $$\mathrm{BrCH_2C \equiv CCH_2Br}$$?

Accepted Answer

1,4-dibromo-2-butyne

Question 11

A molecule is named 4-ethyl-5,7-dimethyl-2-octyne. Which of the following statements is TRUE about its structure?

Accepted Answer

The triple bond starts at carbon 2, and there are ethyl and methyl groups at carbons 4, 5, and 7.

Question 12

Which of the following is the correct condensed structural formula for 2-butyne?

Accepted Answer

$$\mathrm{CH_3C \equiv $$CCH_3$$}$$

Question 13

Which of the following is the correct IUPAC name for a four-carbon alkyne with a fluoro group on carbon 4 and the triple bond starting at carbon 1?

Accepted Answer

4-fluoro-1-butyne

Question 14

Which of the following is the correct name for a five-carbon alkyne with two bromine atoms on carbon 1 and the triple bond starting at carbon 2?

Accepted Answer

1,1-dibromo-2-pentyne

Question 15

Which of the following is a correct statement about the properties of alkynes?

Accepted Answer

Alkynes have similar properties to alkenes.

Question 16

Which of the following is the correct expanded structure for 3-heptyne?

Accepted Answer

$$\mathrm{CH_3CH_2C \equiv CCH_2CH_2CH_3}$$

Question 17

Which of the following is the correct IUPAC name for the molecule with the structure $$\mathrm{CH_3CH_2C \equiv $$CCH_3$$}$$?

Accepted Answer

2-pentyne

Question 18

Which of the following is NOT a correct rule for naming alkynes?

Accepted Answer

Number the chain from the end closest to the longest substituent.

Question 19

Which of the following is the correct name for a molecule with a triple bond between carbons 2 and 3 in a four-carbon chain?

Accepted Answer

2-butyne

Alkynes: Structure, Nomenclature, and Properties

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