Textbook Question
What is the molecular formula for each of the following?
a. a 4-carbon hydrocarbon with two bonds and no rings
3
views
Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
All textbooks
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 1
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 1Chapter 6, Problem 1
What is the molecular formula for a 5-carbon hydrocarbon with one bond and one ring?
Verified step by step guidance1
Step 1: Understand the problem. A 5-carbon hydrocarbon with one π bond and one ring indicates that the molecule is cyclic and contains a double bond. This means it is an unsaturated hydrocarbon.
Step 2: Recall the general formula for hydrocarbons. Saturated hydrocarbons (alkanes) follow the formula CnH2n+2. However, the presence of a ring and a π bond reduces the number of hydrogens.
Step 3: Account for the ring. A ring introduces one degree of unsaturation, which reduces the hydrogen count by 2. The formula for a 5-carbon ring without any double bonds would be C5H10.
Step 4: Account for the π bond. A double bond introduces another degree of unsaturation, further reducing the hydrogen count by 2. Subtract 2 hydrogens from the formula in Step 3.
Step 5: Combine the information. The molecular formula is determined by considering the 5 carbons, the reduction in hydrogens due to the ring, and the reduction due to the π bond. Write the final molecular formula as C5H8.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
4mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hydrocarbons
Hydrocarbons are organic compounds consisting entirely of hydrogen and carbon atoms. They can be classified into aliphatic (straight or branched chains) and aromatic (ring structures). Understanding the structure of hydrocarbons is essential for determining their molecular formulas and properties.
Recommended video:
Guided course
04:52
Aromaticity of Hydrocarbons
Unsaturation and π Bonds
Unsaturation in organic chemistry refers to the presence of double or triple bonds between carbon atoms, indicated by π (pi) bonds. Each π bond reduces the number of hydrogen atoms that can be attached to the carbon skeleton. In this case, the presence of one π bond suggests that the hydrocarbon is unsaturated, affecting its molecular formula.
Recommended video:
Guided course
02:39The difference between saturated and unsaturated molecules.
Cyclic Compounds
Cyclic compounds are organic molecules that contain a ring structure. The presence of a ring can influence the molecular formula and the degree of unsaturation. For a hydrocarbon with a ring and a π bond, the ring structure contributes to the overall count of carbon and hydrogen atoms, which is crucial for deriving the correct molecular formula.
Recommended video:
Guided course
01:40Defining meso compounds.