Question

What is each compound’s systematic name?

Short answer

a. 5-bromo-2-hexyne

b. 5-methyl-2-octyne

c. 5,5-dimethyl-2-hexyne

d. 6-chloro-2-methyl-3-heptyne

e. 1,5-cyclooctadiene

f. 1,6-dimethyl-1,3-cyclohexadiene

Step-by-step solution

 Step 1:Definition of systematic nomenclature- 

A systematic name is a name given to a single unique group, organism, object, or chemical entity within a population or collection in a systematic manner.

A nomenclature usually includes systematic names.

Rules for writing the nomenclature of alkyne for b), c), e) and f)-

• 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.

Rules for writing the nomenclature of alkyne with more than one functional group for a) and d)-

• Find the longest continuous chain having both functional groups and insert both suffixes at the end of the name to name an alkene in which the second functional group is not another double bond but has a functional group suffix.

• Before the name of the parent chain, the number denoting the location of the first-stated functional group is normally placed. The number identifying the functional group's location is placed directly before the suffix for that functional group.

• Number the chain in the way that produces a name with the lower number if the two functional groups are a double bond and a triple bond.

• Number the functional group suffixes if the second functional group suffix has a higher priority than the alkene suffix.