19. The catalytic mechanism below is an example of: (A) covalent nucleophilic catalysis, (B) covalent electrophilic catalysis, (C) specific base catalysis, (D) general base catalysis, (E) low barrier hydrogen bond catalysis.

19. The catalytic mechanism below is an example of:

(A) covalent nucleophilic catalysis,
(B) covalent electrophilic catalysis,
(C) specific base catalysis,
(D) general base catalysis,
(E) low barrier hydrogen bond catalysis.

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8. All of the following statements about cyclic sugars are true EXCEPT: (A) The a-anomer has the -OH of the anomeric carbon positioned on the same side of the sugar ring from the -CH2OH, (B) The five and six membered rings are more frequently observed due to stability, (C) In a chair conformation, the predominant form has the bulkiest substituents occupying equatorial positions, (D) The carbonyl carbon becomes a chiral center, (E) They can be formed by the intramolecular reactions to hemiacetals or hemiketals.

19. The catalytic mechanism below is an example of:

(A) covalent nucleophilic catalysis,
(B) covalent electrophilic catalysis,
(C) specific base catalysis,
(D) general base catalysis,
(E) low barrier hydrogen bond catalysis.

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