Use the Following Acid Ionization Constants to Identify the Correct $\mathrm { HF } \quad K _ { \mathrm { a } } = 7.2 \times 10 ^ { - 4 }$

Multiple Choice

Use the following acid ionization constants to identify the correct decreasing order of base strengths for the conjugate bases. $\mathrm { HF } \quad K _ { \mathrm { a } } = 7.2 \times 10 ^ { - 4 }$
$\mathrm { HNO } _ { 2 } \quad K _ { \mathrm { a } } = 4.5 \times 10 ^ { - 4 }$
$\mathrm { HCN } \quad K _ { \mathrm { a } } = 6.2 \times 10 ^ { - 10 }$

A) CN^- > NO₂^- > F^-
B) NO₂^- > F^- > CN^-
C) F^- > CN^- > NO₂^-
D) F^- > NO₂^- > CN^-
E) NO₂^- > CN^- > F^-