Hello everyone. Today, we have the following problem name the alky shown below a 33 dimethyl five hep B 55 dimethyl two hep C three, dimethyl five hep or D five methyl two hep. So with naming this alk kind, we have to include the longest carbon chain and also ensure that we give the alky here the lowest number as it is the highest priority group. So we will start numbering from left to right. Noting that our alky is on carbon two, we have carbons 456 and seven. So our parent name is two HEP D two because our alky begins on carbon at two. And just a side note with an alky between two different carbons, it always is named using the carbon with the lowest number. So in this case, it's two. So we have Hept and then iron because it is an alky that gets rid of answer choices A and C, we then have to name substituents and we see that we have two methyl groups on carbon five. So they would be named five comma five dash dimethyl because there are two of them. And then when we combine that with a parent name, we arrive at Trace B which is 55 dimethyl to Hepton is our answer overall, I hope is helped. And until next time.

Ch.21 - Organic Chemistry

Tro - Chemistry: A Molecular Approach 4th Edition

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Ch.21 - Organic Chemistry

Problem 53b

Chapter 21, Problem 53b

Name each alkyne. b.

Verified step by step guidance

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 (alkyl groups) 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 the IUPAC naming conventions, with the suffix '-yne' indicating 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. For example, a three-carbon alkyne is named propyne.

Isomerism in Alkynes

Alkynes can exhibit structural isomerism, where compounds with the same molecular formula have different arrangements of atoms. This includes positional isomerism, where the location of the triple bond varies within the carbon chain. Understanding isomerism is crucial for naming and distinguishing between different alkynes, as it can significantly influence their chemical behavior.