Question

Which of the following names are correct? Correct those that are not correct.

a. 4-heptyne

b. 2-ethyl-3-hexyne

c. 4-chloro-2-pentyne

d. 2,3-dimethyl-5-octyne

e. 4,4-dimethyl-2-pentyne

f. 2,5-dimethyl-3-hexyne

Short answer

c, e and f are correct.

Step-by-step solution

Step1: Rules for writing the nomenclature of alkyne.

The systematic name of an alkyne is generated by substituting "yne" for the "ane" in the alkane nomenclature.

• The longest continuous chain containing the carbon–carbon triple bond is numbered in the direction that provides the functional group suffix as low a number as possible, similar to how compounds with other functional groups are designated.
• The alkyne is classified as a terminal alkyne if the triple bond lies at the end of the chain. Internal alkynes are alkynes that have triple bonds elsewhere in the chain.