Which one of the following substances has the highest proton affinity?

Question

Which one of the following substances has the highest proton affinity? (A)  H2S  (B)  NH3  (C)  PH3  (D)  H2O

Tardigrade Admin · Accepted Answer

NH3 is more basic due to more tendency of N to donate its lone pair (having lower electronegativity) than H2O . Hence, it has the highest proton affinity.

Q. Which one of the following substances has the highest proton affinity?

$H_{2} S$

$N H_{3}$

$P H_{3}$

$H_{2} O$

$N H_{3}$ is more basic due to more tendency of $N$ to donate its lone pair (having lower electronegativity) than $H_{2} O$ . Hence, it has the highest proton affinity.

Q. Which one of the following substances has the highest proton affinity?

H2​S

NH3​

PH3​

H2​O

NH3​ is more basic due to more tendency of N to donate its lone pair (having lower electronegativity) than H2​O . Hence, it has the highest proton affinity.

$H_{2} S$

$N H_{3}$

$P H_{3}$

$H_{2} O$

$N H_{3}$ is more basic due to more tendency of $N$ to donate its lone pair (having lower electronegativity) than $H_{2} O$ . Hence, it has the highest proton affinity.