20. Nitrogen's lone pair electrons occupy what type of orbital in pyridine? (A) s (B) sp (C) sp2 (D) sp3 (E) p

23. Carboxylic acids boil at considerably higher temperatures than do alcohols, ketones, or aldehydes of similar molecular weights. This is because they: (A) have a greater oxygen content. (B) are more acidic. (C) form stable hydrogen-bonded dimers. (D) are hydrophobic. (E) none of the above.