Question

PH3 is a weaker base than NH3 . Explain.

Answer 1

Hi friend,

Nh3 is a base due to the presence of lone pair of electrons on the nitrogen atom which available for donation. The size of P atom is larger than N atom, hence the lone pair of electrons on P atom are less readily available for donation as compared to N atom , making PH3 less basic than NH3....i hope it helps you

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Answer 2

Answer:

since P is much larger than N so the Bond length of P-H in PH3 is more than that of N-H in NH3

what does longer bond mean?-- lower bond energy(enthalpy)

so the tendency of PH3 to give H+ is more than that of NH3 so its more acidic than NH3

what does more acidic mean?------ weaker base!!!!

so in terms of basic character

NH3 > PH3 > AsH3 > SbH3 = BiH3

basic character decreases down the group