Open Question
Draw the condensed structural or line-angle formula if cyclic, for each of the following: (11.3, 11.5, 11.6)
b. 1,1-dibromo-2-pentyne
13. Alkenes, Alkynes, and Aromatic Compounds
Naming Alkynes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Give a systematic name for this molecule.
A
10-methyl-8-propyl-4-undecyne
B
10-methyl-8-propyl-4-undecane
C
8-sec-butyl-4-undecene
D
8-tert-butyl-4-undecene
Verified step by step guidance1
Identify the longest carbon chain in the molecule. This chain will determine the base name of the compound. In this case, the longest chain contains 11 carbon atoms, which corresponds to 'undecane'.
Determine the presence of any functional groups or multiple bonds. Here, there is a triple bond present, which changes the suffix from '-ane' to '-yne', making it 'undecyne'.
Number the carbon chain starting from the end nearest to the triple bond to give the lowest possible number to the triple bond. The triple bond starts at the 4th carbon, so the base name becomes '4-undecyne'.
Identify and name the substituents attached to the main carbon chain. There is a methyl group on the 10th carbon and a propyl group on the 8th carbon.
Combine the names of the substituents with the base name, listing them in alphabetical order and using the appropriate locants. The systematic name is '10-methyl-8-propyl-4-undecyne'.
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