Aldehydes and Ketones - Result Question 32

####33. Reagent(s) which can be used to bring about the following transformation is (are)

(2016 Adv.)

(a) LiAlH4 in (C2H5)2O

(b) BH3 in THF

(c) NaBH4 in C2H5OH

(d) Raney Ni/H2 in THF

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Answer:

Correct Answer: 33. (b)

Solution:

  1. Only CHO group is to be reduced to CH2OH.

It can be done using NaBH4 in C2H5OH.

(a) LiAlH4/(C2H5)2O reduces I, II and III into CH2OH, and IV into diol.

(b) BH3/ THF show same properties as (a).

(c) NaBH4/C2H5OH reduces III into CH2OH.

(d) Raney nickel, same as (a) and (b), thus (c) is correct reagent.



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