Question

Rank the given compounds based on their relative Bronsted acidities.

Strongest Bronsted acid to weakest Bronsted acid.

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

Answer 1

A Bronsted acid is one which gives H ions in solution. A species which gives H ions readily is a strong bronsted acid and vice - versa When the atom attached to a hydrogen is highly electronegative, the proton(H) is released readily. The order of electronegativity is: For ha log ens, the size takes more preference over the electronegativity. Also NH3 is basic due to the presence of lone pair and tends to accept protons rather than donate them. So NH3 will be a less strong Bronsted acid than H2S. So the order of decreasing strength of Bronsted acid will be