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Proton accepting tendency is known as strength of basicity.
In R-NH2, N has lone pair of electrons which intensifies due to releasing nature of R group. And hence its tendency to donate the electrons to H+ increases.
After that, among NH3, HS and I, I has the largest size, after that S and then N. And when size increases, tendency to donate electrons decreases. Because it's not easy for bigger atoms to donate electrons because of hindrance. Hence the correct order is
R-NH2>NH3>HS>I.
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