Rank the following Bronsted acids from strongest to weakest:

Question

H-SH
H-CH3
H-NH2
H-F
H-I

Answer 1

In the same column, acids increase most by size; therefore, HI must the strongest.
From left to right, acids increase by electronegativity; therefore, right most atoms are the strongest. From that reasoning, I would expect CH4 to be the weakest.