Hey, everyone were asked which of the following is the correct name for the Alkaline 1st. Let's go ahead and determine our longest carbon chain. So counting this out, we have and eight. So we have an eight carbon chain. So we can go ahead and eliminate A and B. Already. Since this tells us that we have a five carbon chain due to that prefix of pent. Now let's go ahead and determine where our triple bond is located. As we can see right here. Our triple bond is at carbon number four. So C and D. Still stand. Now, if we had reversed this and counted it out in a reverse way such as and eight, we would still have that triple bond located at carbon number four. So the triple bond, no matter which way we counted it out. Is that carbon number four. Now let's go ahead and look at our substitute prints. So looking at our carbon number three, we have a metal substitue in And looking at carbon # six. We also have a method substitue in. So it looks like C is going to be our answer since this tells us that we have two metals on carbons three and six. Now, I hope that made sense. And let us know if you have any questions

Ch.22 - Organic Chemistry

Tro - Chemistry: A Molecular Approach 6th Edition

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Tro 6th Edition

Ch.22 - Organic Chemistry

Problem 55d

Chapter 22, Problem 55d

Name each alkyne. d.

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Identify the longest carbon chain that includes the triple bond. This will determine the base name of the alkyne.

Number the carbon chain starting from the end nearest to the triple bond to give the lowest possible number to the triple bond.

Identify and name any substituents attached to the main carbon chain.

Combine the names of the substituents with the base name of the alkyne, placing the substituents in alphabetical order and using numbers to indicate their positions on the chain.

Ensure the name follows IUPAC nomenclature rules, using the suffix '-yne' to indicate the presence of a triple bond.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Alkynes

Alkynes are a class of hydrocarbons characterized by at least one carbon-carbon triple bond (C≡C). They follow the general formula CnH2n-2, where 'n' is the number of carbon atoms. Alkynes are unsaturated compounds, meaning they contain fewer hydrogen atoms than alkanes and alkenes, which can affect their reactivity and properties.

Nomenclature of Alkynes

The nomenclature of alkynes follows the IUPAC (International Union of Pure and Applied Chemistry) rules, which involve identifying the longest carbon chain containing the triple bond. The name is derived from the number of carbon atoms in the chain, with the suffix '-yne' indicating the presence of a triple bond. The position of the triple bond is indicated by a number, which corresponds to the first carbon of the triple bond in the chain.

Isomerism in Alkynes

Alkynes can exhibit structural isomerism, where compounds have the same molecular formula but different structural arrangements. This can include variations in the position of the triple bond or the branching of the carbon chain. Understanding isomerism is crucial for naming and distinguishing between different alkynes, as each isomer can have distinct physical and chemical properties.