Chemistry 9701 · AS & A Level · Chemical bonding

Chemical bonding — practice question

The boiling points of $\text{Br}_2$, ICl and IBr are shown in the table. The boiling point / $^\circ\text{C}$ values are: $\text{Br}_2$: 59, ICl: 97, IBr: 116. Which row gives the explanation for: • why ICl has a higher boiling point than $\text{Br}_2$ • why IBr has a higher boiling point than ICl?

  • AICl has stronger instantaneous dipole-induced dipoles; IBr has stronger instantaneous dipole-induced dipoles
  • BICl has permanent dipoles; IBr has stronger instantaneous dipole-induced dipoles
  • CICl has stronger instantaneous dipole-induced dipoles; IBr has stronger permanent dipoles
  • DICl has permanent dipoles; IBr has stronger permanent dipoles

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