Question

Which of the following compounds exhibits only dipole-dipole intermolecular interactions?

A. BrCH₂CH₂OH
B. CBr₄
C. CH₃Br
D. Br₂

Answer 1

None of the listed compounds exhibits only dipole-dipole interactions, as all molecules exhibit dispersion forces to some extent. However, CH3Br is the compound that shows significant dipole-dipole interactions due to its polar C-Br bond, making it the best answer for this question. The correct option is (C)

Step-by-step explanation:

To determine which of the following compounds exhibits only dipole-dipole intermolecular interactions, let's examine each option:

1. BrCH2CH2OH: This compound has an OH group, which is capable of hydrogen bonding. This makes it exhibit hydrogen bonding as well as dipole-dipole interactions.
2. CBr4: This compound is symmetric and the polarities of the C-Br bonds cancel out, making it nonpolar. Thus, it exhibits only London dispersion forces.
3. CH3Br: This compound is polar due to the polar C-Br bond, and therefore exhibits dipole-dipole interactions as well as dispersion forces.
4. Br2: This is a diatomic molecule of two identical atoms and is nonpolar. It will exhibit only dispersion forces.

CH3Br is the compound that exhibits dipole-dipole interactions; however, it's crucial to note that it will also exhibit dispersion forces due to the presence of electrons that can form temporary dipoles. No compound exhibits exclusively dipole-dipole interactions, as all molecules exhibit some level of dispersion forces. Still, for the purpose of this question, CH3Br is the best answer, as it is polar and exhibits significant dipole-dipole interactions compared to the other options.