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An aldehyde (A) (C(11)H(8)O), which does...

An aldehyde (A) `(C_(11)H_(8)O)`, which does not undergo self aldol condensation, gives benzaldehyde and 2 mol of (B) on ozonolysis. Compound (B) on oxidation with silver ion gives oxalic acid. Identify the compounds (A) and (B).

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(Tollens reagent oxidises `(-CHO)` group to `(COOH)` group, without breaking `(C=C)` or `(C=C)` or `(C-=C)` bond.
compound (B) is `underset(COOH)underset(|)(CHO)` (Glyoxalic acid).
Proceed reverse to obtained the structure of (A).

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