$HOOC-COOH + HO^{18}CH_2-CH_2^{18}OH \xrightarrow[H^+]{\Delta} (A)$; Product $(A)$ is:

  • A
    Cyclic ester with oxygen atoms from the acid
  • B
    Cyclic ester with $^{18}O$ atoms from the alcohol in the ring
  • C
    Cyclic ester with $^{18}O$ atoms in the carbonyl group
  • D
    Linear monoester

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