Which of the Following Statements Are True? (I) the PK_a

Multiple Choice

Which of the following statements are true? (i) the pK_a of thiols is similar to that to phenols
(ii) little or no hydrogen bonding occurs between thiol molecules
(iii) thiols and disulfides are important in nucleic acid chemistry

A) (i) and (ii) only
B) (i) and (iii) only
C) (ii) and (iii) only
D) (i) , (ii) and (iii)