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Question:

Reagent(s) which can be used to bring about the following transformation is(are): RaneyNi/H2 in THF, NaBH4 in C2H5OH, LiAlH4 in (C2H5)2O, BH3 in THF

LiAlH4in(C2H5)2O

RaneyNi/H2in THF

BH3in THF

NaBH4inC2H5OH

Solution:

NaBH4/C2H5OH do not reduce acid (COOH), ester (COOR) epoxide, as it is a mild reducing agent. It reduces only aldehyde to alcohol. While LiAlH4 is a strong reducing agent, it reduces ester, acid, aldehyde and ketone.