Looking for classes? Ksquare Career Institute, Bengaluru →
Select the reagents that reduce nitriles to primary amines: I. (i) $LiAlH_4$; (ii) $H_2O$ II. $Sn + HCl$ III. $H_2/Ni$ IV. $Na(Hg)/C_2H_5OH$ V. $Br_2/aq.\ NaOH$ Choose the CORRECT answer from the options given below:
A
I, II and III only
B
I, III and IV only
C
I, IV and V only
D
II, IV and V only
Detailed Solution
$R-C \equiv N \rightarrow R-CH_2-NH_2$ can be carried out by:
(i) $LiAlH_4$; (ii) $H_2O$
$H_2/Ni$ (catalytic hydrogenation)
$Na(Hg)/C_2H_5OH$ (Mendius reduction)
$Sn + HCl$ reduces nitro compounds, and $Br_2/aq.\ NaOH$ is the Hofmann bromamide reagent for amides – neither reduces nitriles to primary amines.
So the correct reagents are I, III and IV only.