Skip to main content
Ch.13 Alkenes, Alkynes, and Aromatic Compounds
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.13 Alkenes, Alkynes, and Aromatic Compounds문제 61
13장, 문제 61

2,2,3,3-Tetrabromopentane can be prepared by an addition reaction of excess Br2 with an alkyne. Draw the structure of the alkyne and name it.

검증된 단계별 안내
1
Identify the product structure: The given compound, 2,2,3,3-Tetrabromopentane, has four bromine atoms attached to the second and third carbons of a pentane chain. This indicates that the starting alkyne must have a triple bond between the second and third carbons, as bromine adds across the triple bond in an addition reaction.
Determine the alkyne structure: To form 2,2,3,3-Tetrabromopentane, the alkyne must have five carbon atoms in total, with the triple bond located between the second and third carbons. The structure of the alkyne is CH3-C≡C-CH2-CH3.
Name the alkyne: The IUPAC name for the alkyne is 2-pentyne. The numbering starts from the end of the chain closest to the triple bond to give the lowest possible number to the triple bond.
Explain the reaction: When excess Br2 reacts with an alkyne, the bromine molecules add across the triple bond in two steps. First, the triple bond is converted to a double bond with two bromine atoms added. Then, the double bond reacts with more Br2 to form a single bond with four bromine atoms added in total.
Verify the product: After the addition of excess Br2 to 2-pentyne, the final product is 2,2,3,3-Tetrabromopentane, confirming that the starting alkyne is correctly identified as 2-pentyne.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Alkynes

Alkynes are hydrocarbons that contain at least one carbon-carbon triple bond. They are unsaturated compounds characterized by the general formula CnH2n-2. The presence of the triple bond gives alkynes unique reactivity, making them suitable for various addition reactions, such as halogenation with bromine.
추천 영상:
가이드 코스
4:11
Naming Alkynes Example 1

Addition Reactions

Addition reactions involve the addition of atoms or groups to a molecule, typically across a double or triple bond. In the case of alkynes, the triple bond can react with halogens like Br2, resulting in the formation of a saturated compound. This type of reaction is crucial in organic synthesis for modifying molecular structures.
추천 영상:
가이드 코스
2:55
Addition Reactions Concept 1

Bromination

Bromination is a specific type of addition reaction where bromine (Br2) is added to a compound. For alkynes, this process can lead to the formation of dibrominated products, such as 2,2,3,3-tetrabromopentane. Understanding bromination is essential for predicting the products of reactions involving alkynes and for naming the resulting compounds.
추천 영상:
가이드 코스
0:35
Halogenation Reactions Example 1
관련 실천
교과서 질문

What alkene could you use to make the following products? Draw the structure of the alkene, and tell what other reagent is also required for the reaction to occur.

c.

687
views
교과서 질문

Polyvinylpyrrolidone (PVP) is often used in hair sprays to hold hair in place. Draw a few units of the PVP polymer. The vinylpyrrolidone monomer unit has the following structure:

35
views
교과서 질문

For each of the following reagents, decide whether chlorobenzene will react with it or not, and, if it does, draw and name the products expected from the reaction.

c. HNO3 and H2SO4 catalyst

38
views
교과서 질문

1-Pentyne reacts with HBr in a 1:1 molar ratio to yield two different addition products, both being bromopentenes and having the chemical formula C5H9Br. Draw the structures of two possible products.

988
views
교과서 질문

What alkene could you use to make the following products? Draw the structure of the alkene, and tell what other reagent is also required for the reaction to occur.

d.

872
views
교과서 질문

What alkene could you use to make the following products? Draw the structure of the alkene, and tell what other reagent is also required for the reaction to occur.

a.

812
views