To prepare butanoic acid from 1-propanol, which sequence of reagent(s) is/are best employed?   a) (1) NaCN; (2) H2O; (3) [H+]   b) LiAlH4   c) K2Cr2O7 in acid   d) (1) PBr3; (2) NaCN; (3) H2O; (4) [H+]

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