7. The structures below are: (A) Geometrical isomers (B) Conformational isomers (C) Constitutional isomers (D) Structural isomers (E) Both ( A )and ( D )

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.

7. The structures below are:
(A) Geometrical isomers
(B) Conformational isomers
(C) Constitutional isomers
(D) Structural isomers
(E) Both ( A )and ( D )

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