IUPAC Names of Alkenes and Alkynes Write the IUPAC name of each unsaturated hydrocarbon. Strategy Step 1: Locate the parent chain—the longest chain of carbon atoms that contains the carbon–carbon double or triple bonds. Step 2: Number the parent chain from the direction that gives the carbons of

Question

IUPAC Names of Alkenes and Alkynes

Write the IUPAC name of each unsaturated hydrocarbon.

Strategy

Step 1: Locate the parent chain—the longest chain of carbon atoms that contains the carbon–carbon double or triple bonds.

Step 2: Number the parent chain from the direction that gives the carbons of the double or triple bond the lowest set of numbers. Show the presence of the multiple bond by the suffix -ene (for a double bond) or -yne (for a triple bond). Indicate the presence of the multiple bond by its first number.

Step 3: Name and locate all substituents on the parent chain. List them in alphabetical order.

Accepted Answer

(a) The parent chain contains eight carbons; thus the parent alkene is octene. To show the presence of the carbon–carbon double bond, use the suffi x -ene. Number the chain beginning with the fi rst carbon of the double bond. This alkene is 1-octene.

(b) Because there are four carbon atoms in the chain containing the carbon–carbon double bond, the parent alkene is butene. The double bond is between carbons 2 and 3 of the chain, and there is a methyl group on carbon 2. This alkene is 2-methyl-2-butene.

(c) There are six carbons in the parent chain, with the triple bond between carbons 2 and 3. This alkyne is 2-hexyne.

Question 12.1: IUPAC Names of Alkenes and Alkynes Write the IUPAC name of e...

Related Answered Questions