2. Molecular Representations

PRACTICE:Which of the following pairs of molecules would have the highest boiling point?

Which compound is the least polar compound in a mixture analyzed by thin-layer chromatography (TLC)?

What type of intermolecular force is likely to occur between two water molecules ($H_{2}O$) or strands of DNA ($\mathrm{DNA}$)?

The structure of which of the following compounds suggests that it has the highest boiling point?

What types of molecular interactions are primarily responsible for the stability of base pairs in $DNA$?

The high boiling points and water solubility of smaller amides are primarily due to which type of intermolecular force?

Which type of intermolecular force is primarily responsible for the strong association between molecules of $\mathrm{carboxylic} \mathrm{acids}$?

Which of these phenomena result from hydrogen bonding?

Hydrogen bonds are important for which of the following reasons?

Given the following molecules: ${\mathrm{CH}}_4$ (methane), ${\mathrm{NH}}_3$ (ammonia), $H_{2}O$ (water), and ${\mathrm{CO}}_2$ (carbon dioxide), arrange them in order of increasing boiling point.

Which types of intermolecular forces are present in ${\mathrm{CH}}_2\mathrm{Cl}2$ (dichloromethane)?

Which intermolecular forces are present between two molecules of $C_2{H}_{6}O$ (ethanol)?

PRACTICE:Which of the following pairs of molecules would have the highest boiling point?