24. Which of the following compound(s) would be expected to show intense IR absorption at 3300 cm⁻¹? (I) CH₃C≡CCH₃, (II) butane, (III) but-1-ene, (IV) CH₃CH₂C≡CH, and (V) diethyl amine. (A) I and III. (B) III only. (C) IV only. (D) IV and V. (E) I, IV, and V.

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? (¹⁸O-ester + OH⁻/H₂O → R-COOH + R’-OH) (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.

24. Which of the following compound(s) would be expected to show intense IR absorption at 3300 cm⁻¹? (I) CH₃C≡CCH₃, (II) butane, (III) but-1-ene, (IV) CH₃CH₂C≡CH, and (V) diethyl amine.
(A) I and III.
(B) III only.
(C) IV only.
(D) IV and V.
(E) I, IV, and V.

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