Question
Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques
In HS-,I-,R–NH2, NH3 order of proton excepting tendency will be :-
A
I- > NH3 > R–NH2 > HS-
B
NH3 > R-NH2 > HS- > I-
C
RNH2 > NH3 > HS-> I-
D
HS-> RNH2 > NH3 > I-
Answer
RNH2 > NH3 > HS-> I-
Explanation
Solution
The correct option is (C): RNH2 > NH3 > HS-> I-
The order of proton-accepting tendencies is as follows: R−NH2 > NH3 > HS- > I-.
The reduced proton-accepting ability of the iodide ion is attributed to its larger size, which leads to a lower charge density due to the negative charge being distributed over a larger area. Conversely, alkylamines exhibit a greater propensity to accept protons compared to ammonia, owing to the +I (inductive effect) influence of the alkyl group.