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Why the proton accepting tendency follows the following order: R-NH2 > NH3 > HS- > I-

Why the proton accepting tendency follows the following order: R-NH2 > NH3 > HS- > I-

Grade:12

1 Answers

Arun
25763 Points
2 years ago

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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