$Ph-CO_2H$ $\xrightarrow{SOCl_2} A$ $\xrightarrow{Me_2NH} B$ $\xrightarrow{(C)} Ph-CHO$. The unknown reagent $(C)$ is:

  • A
    $LiAlH_4$
  • B
    $NaBH_4$
  • C
    $LiAlH(Ot-Bu)_3$
  • D
    $PCC/CH_2Cl_2$

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