Ch. 2 - Molecular RepresentationsWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins

Solution: The following compounds have similar molecular weights. Which has the highest boiling point.A)        CH3CH=OB)        C2H5OHC)        CH3OCH3D)        CH3CH2CH3

Solution: The following compounds have similar molecular weights. Which has the highest boiling point.A)        CH3CH=OB)        C2H5OHC)        CH3OCH3D)        CH3CH2CH3

Problem

The following compounds have similar molecular weights. Which has the highest boiling point.

A)        CH3CH=O

B)        C2H5OH

C)        CH3OCH3

D)        CH3CH2CH3

Solution

We’re being asked to determine the compound with the highest boiling point among the choices.


Recall that the boiling and melting point of a compound depends primarily on its mass and intermolecular forces. The types of intermolecular forces (IMF) are:

1. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F; strongest IMF

2. Dipole-dipole interaction – occurs between two polar covalent compounds; 2nd strongest IMF

3. London dispersion forces – occurs in all compounds and is the primary IMF exhibited by nonpolar compounds; weakest IMF


Since the given compounds have similar molecular weights, we only need to determine the type of IMF present.


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