IB DP Chemistry: HL复习笔记4.3.2 Deducing Intermolecular Forces

• In order to deduce the types of intermolecular forces present in molecules you need information about the structure and chemical formula of the molecules
• The chemical formula will tell you about the presence of electronegative elements present in the molecule
  • Any potential polar bonds can be identified
  • If N, O or F is present then hydrogen bonds are potentially possible
• The structure and symmetry of the molecule will enable you to determine if the molecule is polar following the principles laid out in 4.1.10 Molecular Polarity

Answer:

The correct option is D.

• • Draw the displayed structures of the molecules:

• • Molecules A and B form dipole-dipole attractions as they are polar molecules
  • Molecule C forms dispersion forces as the dipoles cancel out so there is no overall polarity
  • Molecule D is the only one capable of forming hydrogen bonds