An acidic compound `(A) (C_4 H_8 O_3)` loses its optical activity on strong heating yielding `(B) (C_4 H_6 O_2)` which reacts readly with `KMnO_4`. `(B)` forms a dervative `( C)` with `SOCl_2` which on reaction with `(CH_3)_2 NH` gives `(D)`. The compound `(A)` on oxidation with dilute chromic acid gives an unstable compound `(E)` which decarboxylates readily to give `(F) (C_3 H_6 O)`. The compound `(F)` gives a hydrocarbon `(G)` on treatment with amalgamated `Zn` and `HCl`. Give the structures of `(A)` to `(G)` with proper reasoning.

Answer

`(##ALN_CHM_C09(II)_E01_818_A01##)`