Multiple Choice
In the context of degrees of unsaturation, a carbon-carbon triple bond contributes how many degrees of unsaturation to a molecule?
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Table of contents
- 1. A Review of General Chemistry5h 6m
- Summary23m
- Intro to Organic Chemistry4m
- Atomic Structure17m
- Wave Function9m
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- Octet Rule12m
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- Formal Charges6m
- Skeletal Structure14m
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- Degrees of Unsaturation15m
- Constitutional Isomers14m
- Resonance Structures46m
- Hybridization23m
- Molecular Geometry16m
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- 2. Molecular Representations1h 14m
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- 29. Amino Acids4h 20m
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- Acid-Base Properties of Amino Acids33m
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- Reactions of Amino Acids: Esterification7m
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- Intro to Citric Acid Cycle7m
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- 34. Nucleic Acids1h 32m
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- Electron Configuration of Elements45m
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- Electron Counting10m
- The 18 and 16 Electron Rule13m
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- Buchwald-Hartwig Amination Reaction19m
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- Catalytic Allylic Alkylation18m
- Alkene Metathesis23m
- 36. Synthetic Polymers1h 49m
- Introduction to Polymers6m
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- Radical Polymerization15m
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- Polymers Structure and Properties8m
1. A Review of General Chemistry
Degrees of Unsaturation
Multiple Choice
Which molecular formula could represent an acyclic alkyne (a hydrocarbon containing exactly one triple bond)?
A
B
C
D
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Verified step by step guidance1
Recall the general formula for acyclic (open-chain) hydrocarbons: alkanes have the formula \(C_nH_{2n+2}\), alkenes have \(C_nH_{2n}\), and alkynes have \(C_nH_{2n-2}\), where \(n\) is the number of carbon atoms.
Since the problem specifies an acyclic alkyne, use the formula for alkynes: \(C_nH_{2n-2}\).
Substitute \(n = 5\) (because the molecular formulas given all have 5 carbons) into the alkyne formula: \(C_5H_{2(5)-2} = C_5H_8\).
Compare this result to the given options: \(C_5H_6\), \(C_5H_{12}\), \(C_5H_8\), and \(C_5H_{10}\). The formula matching \(C_5H_8\) fits the alkyne formula.
Therefore, the molecular formula representing an acyclic alkyne with 5 carbons is \(C_5H_8\).
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