$(A) Ph-CH(OH)-CHO \xrightarrow[H_2O]{HO^-} (B)$; $(A)$ and $(B)$ are isomers and isomerization is effectively carried out by a trace of base. Identify $(B)$.
- A$Ph-CH_2-COOH$
- B$Ph-CO-OCH_3$
- C$Ph-CO-CH_2OH$
- D$H-CO-CH_2-O-Ph$
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Identify the reagents $(1-4)$ required for the transformations shown and arrange them in the correct order.
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$(4)$ $NaBH_4$
$(1)$ $LiAlH_4$
$(2)$ $OsO_4$
$(3)$ $NaIO_4$
$(4)$ $NaBH_4$
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