Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

Ethane, $\text{CH}_3\text{CH}_3$, and fluoromethane, $\text{CH}_3\text{F}$, contain the same total number of electrons in their molecules. Their boiling points are listed as follows: $\text{CH}_3\text{CH}_3$ = $184.5\,\text{K}$, $\text{CH}_3\text{F}$ = $194.7\,\text{K}$. What causes this difference in boiling points?

  • A$\text{CH}_3\text{F}$ has a larger $M_r$ than $\text{CH}_3\text{CH}_3$.
  • B$\text{CH}_3\text{F}$ has a permanent dipole, $\text{CH}_3\text{CH}_3$ does not.
  • C$\text{CH}_3\text{F}$ has a strong C-F bond, $\text{CH}_3\text{CH}_3$ does not.
  • DHydrogen bonding occurs in $\text{CH}_3\text{F}$, but not in $\text{CH}_3\text{CH}_3$.

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI