pBlock ElementsII - Result Question 64

####59. Among the following, the correct statement is

(a) Between NH3 and PH3,NH3 is a better electron donor because the lone pair of electrons occupies spherical ’ s ’ orbital and is less directional

(b) Between NH3 and PH3,PH3 is a better electron donor because the lone pair of electrons occupies sp3-orbital and is more directional

(c) Between NH3 and PH3,NH3 is a better electron donor because the lone pair of electrons occupies sp3-orbital and is more directional

(d) Between NH3 and PH3,PH3 is a better electron donor because the lone pair of electrons occupies spherical ’ s ’ orbital and is less directional

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Solution:

  1. NH3 is stronger Lewis base than PH3. In a group of hydrides, basic strength decreases down the group.


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