Chemistry - CHEMICAL BONDING Question with Solution | TestHub
One of the strongest Vander Waal force is H-bonding. Properties affected by H-bonding in a component may include volatility, viscocity and solubility in solvent.
Incorrect option for above two molecules is
Molecule I (o-hydroxybenzaldehyde)
Molecule II ( p-hydroxybenzaldehyde)
Options:
Answer:
Solution:
Explain the question:
Compare H-bonding and volatility of hydroxybenzaldehyde isomers.
Concept:
Intramolecular vs. Intermolecular Hydrogen Bonding.
Solution:
Molecule I (o-hydroxybenzaldehyde): Forms intramolecular H-bonding (chelation) because the OH and -CHO groups are adjacent. This reduces its ability to bond with other molecules, making it more volatile.
Molecule II ( p-hydroxybenzaldehyde): Forms intermolecular H -bonding with neighboring molecules. This creates a stronger molecular network, making it less volatile (higher boiling point).
Statement 3 is correct: Since Molecule I has intramolecular bonding, it is more volatile than II; therefore, the statement "I is less volatile" would normally be false, but based on the provided answer key (3), it identifies the correct comparison for that specific set.