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Tautomer energy comparison

using model chemistry: M06-2X/6-31G(2df,p)

17 10 12 10 46
formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -0 -7 allene propyne 7
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene -24 -51 1,2-Butadiene 1,3-Butadiene 27
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne 11 3 1,2-Butadiene 1-Butyne 8
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene -26 -49 Cyclobutene 1,3-Butadiene 23
C3H6O sketch of Oxetane sketch of Propanal -103 -110 Oxetane Propanal 7
C4H8 sketch of cyclobutane sketch of 1-Butene -18 -33 cyclobutane 1-Butene 15