Question

Reagent(s) which can be used to bring about the following transformation is(are)
(A) LiAlH₄ in (C₂H₅)₂O (B) BH₃ in THF
(C) NaBH₄ in C₂H₅OH (D) Raney Ni/H₂ in THF

Answer 1

Here, we clearly notice that carboxylic acid and ester are not reduced.

Only Aldehyde group is being reduced.

(C) NaBH₄ in C₂H₅OH is the answer

Because it is relatively a mild reducing agent than the others.

!! I've attached an important table which is very useful while solving such kind of problems.

Answer 2

Answer:

C & D

Explanation:

Both NaBH4 is ethanol and Raney Ni/H2 in THF reduces aldehyde to alcohol