21. All are true for low-barrier hydrogen bonds EXCEPT:
(A)The hydrogen is centered between the two heteroatoms.
(B)The interactions are more covalent.
(C)The bond order approaches 0.5 for both O-H interactions.
(D)The barrier that the hydrogen atom must surmount to exchange oxygens becomes lower.
(E)All are true.

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統計： A(0), B(0), C(1), D(0), E(0) #2847550