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Ch.21 - Organic Chemistry
Tro - Chemistry: A Molecular Approach 4th Edition
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Tutti i libri di testoTro 4th EditionCh.21 - Organic ChemistryProblema 34
Capitolo 21, Problema 34

Based on the molecular formula, determine whether each com- pound is an alkane, alkene, or alkyne. (Assume that the hydro- carbons are noncyclical and there is no more than one multiple bond.)
a. C8H16 b. C4H6 c. C7H16 d. C2H2

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1
Determine the general formula for alkanes, which is C_nH_{2n+2}.
Determine the general formula for alkenes, which is C_nH_{2n}.
Determine the general formula for alkynes, which is C_nH_{2n-2}.
For each compound, compare its molecular formula to the general formulas for alkanes, alkenes, and alkynes.
Classify each compound based on which general formula it matches.

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Hydrocarbon Classification

Hydrocarbons are organic compounds consisting solely of hydrogen and carbon. They are classified into three main categories: alkanes (single bonds), alkenes (at least one double bond), and alkynes (at least one triple bond). Understanding the type of bonds present in a hydrocarbon is essential for determining its classification.
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Intro To Hydrocarbons

General Formula for Hydrocarbons

Each class of hydrocarbons has a general formula that helps identify their structure. Alkanes follow the formula CnH2n+2, alkenes follow CnH2n, and alkynes follow CnH2n-2. By comparing the molecular formula of a compound to these general formulas, one can ascertain whether it is an alkane, alkene, or alkyne.
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Intro To Hydrocarbons

Degree of Unsaturation

The degree of unsaturation indicates the number of rings and multiple bonds in a hydrocarbon. It can be calculated using the formula: Degree of Unsaturation = (2C + 2 + N - H - X)/2, where C is the number of carbons, N is the number of nitrogens, H is the number of hydrogens, and X is the number of halogens. A higher degree of unsaturation suggests the presence of double or triple bonds, which is crucial for classifying the compound.
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Saturated and Unsaturated Hydrocarbons
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