Question 1

Which type of bond is characteristic of alkynes?

Accepted Answer

Triple bond

Question 2

What is the correct IUPAC ending for naming alkynes?

Accepted Answer

yne

Question 3

When naming an alkyne, which chain should be chosen as the parent chain?

Accepted Answer

The longest chain containing the triple bond

Question 4

Which of the following is NOT a property of alkynes?

Accepted Answer

They can have cis/trans isomers

Question 5

Given the molecule with the structure shown in the image (a seven-carbon chain with a triple bond and two methyl groups), what is the correct systematic name?

Accepted Answer

2,6-dimethyl-3-heptyne

Question 6

When numbering the parent chain in an alkyne, from which end should you start?

Accepted Answer

From the end closest to the triple bond

Question 7

Which of the following is the correct order for naming an alkyne with substituents?

Accepted Answer

location-substituent-location-parent-modifier

Question 8

If there is a tie between longest chains when naming an alkyne, which chain should be chosen?

Accepted Answer

The chain with more substituents

Question 9

What is the correct structure for 4-ethyl-7-phenyl-2-heptyne?

Accepted Answer

A seven-carbon chain with a triple bond between carbons 2 and 3, an ethyl group on carbon 4, and a phenyl group on carbon 7

Question 10

Which of the following is the correct formula for a straight-chain alkyne with 7 carbons?

Accepted Answer

$$\mathrm{C}_7\mathrm{H}_{12}$$

Question 11

Which of the following statements about alkynes is TRUE?

Accepted Answer

Alkynes are named by finding the longest chain containing the triple bond

Question 12

What is the correct IUPAC name for a molecule with a triple bond starting at carbon 3, and methyl groups at carbons 2 and 6 on a heptane chain?

Accepted Answer

2,6-dimethyl-3-heptyne

Question 13

Which of the following is a correct step in naming alkynes?

Accepted Answer

Assign the lowest possible number to the triple bond

Question 14

Which of the following molecules is an alkyne?

Accepted Answer

$$\mathrm{C}_2\mathrm{H}_2$$

Question 15

Which of the following is the correct condensed structural formula for 3-heptyne?

Accepted Answer

$$\mathrm{CH}_3\mathrm{CH}_2\mathrm{C}\equiv\mathrm{C}\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$

Question 16

Which of the following is the correct molecular formula for 2-hexyne?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{10}$$

Question 17

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

Accepted Answer

Alkynes have higher boiling points than alkanes of similar molecular weight

Question 18

Which of the following is the correct IUPAC name for a molecule with a triple bond at carbon 2 and an ethyl group at carbon 4 on a heptane chain?

Accepted Answer

4-ethyl-2-heptyne

Alkyne Nomenclature and Structure in GOB Chemistry

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