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Two organic compounds (A) and (B) with m...

Two organic compounds (A) and (B) with molecular formula, `C_3H_6O` , react with HCN in different manner to produce (C) and (D) respectively. One subsequent hydrolysis of (C) and (D) give optically active substances (E) and (F). Both (E) and (F) on decarboxylation give I - propanol . What are (A), (B) , (C) , (D) , (E) and (F) ?

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(A) is `CH_3CH_2CHO, ` (B) is `CH_2=CHCH_2OH,` (C) is `CH_3CH_2CH(OH)CN,` (D) is `CH_3CH(CN)CH_2OH,(E) ` is `CH_3CH_2Ch(OH)COOH` and is (F) is `CH_3(COOH) CH_2OH. ` (E) and (F) are optically active.
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