Question

20 mark for review ne, hf, c₂h₆, ch₄ which of the substances listed above has the highest boiling point, and why? a ne, because its atoms have the largest radius b hf, because its molecules form hydrogen bonds c c₂h₆, because each molecule can form multiple hydrogen bonds d ch₄, because its molecules have the greatest london dispersion forces

Explanation:

Step1: Analyze intermolecular forces

Intermolecular forces affect boiling - point. Hydrogen bonds are stronger than London - dispersion forces.

Step2: Evaluate each substance

• Ne is a noble gas with only London - dispersion forces.
• HF has hydrogen bonds due to the highly electronegative F atom and the H atom directly bonded to it.
• C₂H₆ is a non - polar molecule and has only London - dispersion forces.
• CH₄ is a non - polar molecule and has only London - dispersion forces.

Step3: Determine the substance with the highest boiling point

Since hydrogen bonds are stronger than London - dispersion forces, the substance with hydrogen bonds will have a higher boiling point. Among the given substances, HF forms hydrogen bonds.

Answer:

B. HF, because its molecules form hydrogen bonds