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Which one of the following arrangements represents the correct order of the proton affinity of the given species :
The conjugate acids for the species are $$HI$$, $$HF$$, $$H_2S$$, and $$NH_3$$, with the acidity order being $$HI > HF > H_2S > NH_3$$.
Consequently, the proton affinity order follows the reverse trend of basicity: $$I^- < F^- < HS^- < NH_2^-$$.
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