28. Which of the following is not correct? (A) Tautomers are constitutional isomers. (B) Tautomers rapidly interconvert. (C) The enol form is generally more stable. (D) Tautomerization is catalyzed by both acids and bases. (E) All of the above are correct with respect to tautomers.

4. trans-1-tert-Butyl-4-isopropylcyclohexane has two conformers. Using the following data to calculate the strain in this two conformers, by how much kJ/mol that one is favored than the other?If, H-C-C-H eclipsed interaction strain: 4 kJ/mol;CH3-C-C-H eclipsed interaction strain: 6 kJ/molCH3-C-C-CH3 eclipsed interaction strain: 11 kJ/mol;CH3-C-C-CH3 gauche interaction strain: 3.8 kJ/mol Each one strain (S) of 1, 3-X-H diaxial interaction in monosubstitutedcyclohexane (kJ/mol): (A) 9.2 (B) 22.8 (C) 32 (D) 16 (E) 11.4

28. Which of the following is not correct?
(A) Tautomers are constitutional isomers.
(B) Tautomers rapidly interconvert.
(C) The enol form is generally more stable.
(D) Tautomerization is catalyzed by both acids and bases.
(E) All of the above are correct with respect to tautomers.

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