30. Arrange the indicated hydrogen in order of increasing acidity (i.e., least acidic first). (A) I, III, IV, II (B) IV, II, I, III (C) I, III, II, IV (D) III, I, II, IV (E) None of the above.

47. When an ¹⁸O-labelled ester is treated with NaOH in H₂O, carboxylic acid and alcohol are isolated. Which of the following statements is true? (A) ¹⁸O remains in both oxygen atoms of the carboxylic acid. (B) The solvent water should contain ¹⁸O. (C) ¹⁸O remains in the carbonyl oxygen only. (D) ¹⁸O remains in alcohol only. (E) ¹⁸O is found in both the carboxylic acid and the alcohol.

30. Arrange the indicated hydrogen in order of increasing acidity (i.e., least acidic first).

(A) I, III, IV, II
(B) IV, II, I, III
(C) I, III, II, IV
(D) III, I, II, IV
(E) None of the above.

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