Correct Answer - D
The formula `C_(4)H_(4)O_(4)` cannot represent acyclic ether. The formula `C_(4)H_(4)O_(4)` represents
(A) a cyclic ester
(B) a cis or `{:(CHCOOH),(||),(CHCOOH),("Maleic acid (cis)"):}`
(c) trans dibasic acid `{:(" "CHCOOH),(" ||"),(HOOC CH),(" Fumaric acid (trans)"):}`
