Which of the following statements concerning the tautomeric forms of bases such as uracil is correct?
A)The double-lactim form contains a ketone group.
B)The lactam form contains an alcohol group.
C)The lactam form predominates at neutral pH.
D)Formation of the lactim from the lactam is irreversible.
E)The lactim and double-lactim forms are stabilized at high pH.

Question

Quizplus · Accepted Answer

The lactam form predominates at neutral pH, while the lactim form predominates at high and low pH. The lactam form contains an amide group, while the lactim form contains an imine group. The formation of the lactim from the lactam is reversible. Neither the lactim nor the double-lactim forms are stabilized at high pH.

Which of the Following Statements Concerning the Tautomeric Forms of Bases