Question

The reagent used to convert pentanenitrile to pentanal?
(A) K,Cr2O_with aqueous H,SO, in acetone
(B) DIBAL-H
(C) KMnO, with aqueous H, SO, in acetone
(D) PCC in CH2Cl2​

Answer 1

Answer:

(B) DIBAL-H

Explanation:

Answer 2

Answer:

pentanenitrile to pentanal is converted in the presence of reagent DIBAL-H.

CH3-CH2-CH2-C≡N -------------> CH3-CH2-CH2-CH2-CHO

DIBAL-H  Diisobutylaluminium hydride

DIBAL-H is a reducing reagent.

it is mainly used in α,β-unsaturated carbonyl compounds to allylic alcohols.

DIBAL will also do partial reductions of nitriles to imines. the above reaction is example.

so option B is correct answer.

PCC is used to convert primary alcohols to aldehydes and from secondary alcohols to ketones.