pBlock ElementsII 1 Question 64
59. Among the following, the correct statement is
(a) Between $\mathrm{NH} _{3}$ and $\mathrm{PH} _{3}, \mathrm{NH} _{3}$ is a better electron donor because the lone pair of electrons occupies spherical ’ $s$ ’ orbital and is less directional
(b) Between $\mathrm{NH} _{3}$ and $\mathrm{PH} _{3}, \mathrm{PH} _{3}$ is a better electron donor because the lone pair of electrons occupies $s p^{3}$-orbital and is more directional
(c) Between $\mathrm{NH} _{3}$ and $\mathrm{PH} _{3}, \mathrm{NH} _{3}$ is a better electron donor because the lone pair of electrons occupies $s p^{3}$-orbital and is more directional
(d) Between $\mathrm{NH} _{3}$ and $\mathrm{PH} _{3}, \mathrm{PH} _{3}$ is a better electron donor because the lone pair of electrons occupies spherical ’ $s$ ’ orbital and is less directional
Show Answer
Answer:
Correct Answer: 59. (c)
Solution:
- $\mathrm{NH} _{3}$ is stronger Lewis base than $\mathrm{PH} _{3}$. In a group of hydrides, basic strength decreases down the group.
