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An organic compound (A) on treatment wit...

An organic compound (A) on treatment with acetic acid in the presence of sulphuric acid produces an ester (B). (A) on mild oxidation gives (C ). (C) with 50% KOH followed by acidification with dilute HCl generates (A) and (D). (D) with `PCl_(5)` followed by reaction with ammonia gives (E). (E) on dehydration produces hydrocyanic acid. Identify the compounds. A, B, C, D, and E.

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