Arrange the compounds in order of decreasing [tex]\mathrm{p} K_a[/tex], highest first.
highest [tex]p K_a[/tex]
lowest [tex]p K_a[/tex]
[tex]\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH} \quad \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{SH} \quad \mathrm{ClCH}_2 \mathrm{CH}_2 \mathrm{SH}[/tex]