IIT/JEE Chemistry Practice #19: Molecular Properties

The video tutorial by Professor Dave covers molecular properties, focusing on the volatility of ethers compared to alcohols, the factors affecting lattice energy in ionic compounds, and the solubility differences in ortho, meta, and para nitrophenol. It explains the role of hydrogen bonding in volatility, Coulomb's law in lattice energy, and intramolecular interactions in solubility.

What is the main reason ethers are more volatile than alcohols with the same molecular formula?

• Alcohols have a higher molecular weight.

• Ethers lack hydrogen bonding capability.

• Alcohols have weaker dipole interactions.

• Ethers have stronger hydrogen bonds.

In the context of molecular properties, what does volatility refer to?

• The ability to dissolve in water.

• The strength of covalent bonds.

• The capacity to form ionic bonds.

• The tendency to enter the gas phase.

Which of the following factors does the lattice energy of an ionic compound depend on?

• The phase of the compound.

• The color of the ions.

• The temperature of the environment.

• The charges and sizes of the ions.

According to Coulomb's law, what happens to the lattice energy as the size of the ions increases?

• It increases.

• It becomes zero.

• It decreases.

• It remains constant.

Why is ortho nitrophenol less soluble in water compared to its para and meta isomers?

• It has a higher molecular weight.

• It has a larger surface area.

• It forms stronger bonds with water.

• It exhibits intramolecular hydrogen bonding.

What type of bonding is responsible for the reduced solubility of ortho nitrophenol in water?

• Intermolecular hydrogen bonding

• Covalent bonding

• Intramolecular hydrogen bonding

• Ionic bonding

What is the role of the hydroxyl group in the solubility of phenols?

• It decreases solubility by forming ionic bonds.

• It increases solubility by interacting with water.

• It has no effect on solubility.

• It increases solubility by forming covalent bonds.