Final answer:
The molecule that exhibits dipole-dipole attraction among the given options is AsH₃ because it is a polar molecule with a net dipole moment.
Step-by-step explanation:
The student is asking about a concept in chemistry related to intermolecular forces, specifically dipole-dipole attractions. Among the listed molecules, (a) SF₄, (b) AsH₃, (c) CO₂, (d) BCl₃, and (e) Cl₂, the molecule that exhibits dipole-dipole attraction between its molecules is AsH₃ (b).
This is because AsH₃ is a polar molecule with a net dipole moment due to the asymmetric distribution of electron density. The arsenic atom has a partial positive charge, while the hydrogen atoms have a partial negative charge, which creates a polar molecule capable of dipole-dipole interactions.