NH_(3) has higher proton affinity than PH_(3). Explain. Or NH_(3) is more basic than PH_(3).

NH_(3) has higher proton affinity than PH_(3). Explain. Or NH_(3) is m

1.	NH_(3) has higher proton affinity than PH_(3). Explain. Or NH_(3) is more basic than PH_(3).
Answer» SOLUTION :Due the presence of a lone PAIR of electrons on N and P, both `NH_(3)andPH_(3)` act as Lewis bases and accept a proton to FORM and additional N-H and P-H bonds respectively However, due to smaller size of N over P, N-H bond thus formed ismuch stronger than the P-H bond Therefore, `NH_(3)` has higher proton affinity than `PH_(3)`. In other words, `NH_(3)` is more basic than `PH_(3)`.