pBlock ElementsII - Result Question 64
####59. Among the following, the correct statement is
(a) Between $NH _3$ and $PH _3, NH _3$ is a better electron donor because the lone pair of electrons occupies spherical ’ $s$ ’ orbital and is less directional
(b) Between $NH _3$ and $PH _3, PH _3$ is a better electron donor because the lone pair of electrons occupies $s p^{3}$-orbital and is more directional
(c) Between $NH _3$ and $PH _3, NH _3$ is a better electron donor because the lone pair of electrons occupies $s p^{3}$-orbital and is more directional
(d) Between $NH _3$ and $PH _3, PH _3$ is a better electron donor because the lone pair of electrons occupies spherical ’ $s$ ’ orbital and is less directional
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Solution:
- $NH _3$ is stronger Lewis base than $PH _3$. In a group of hydrides, basic strength decreases down the group.
