Nitrogen Containing CompoundMedium

Question

Select the reagents that reduce nitriles to primary amines.

A (i) ${LiAlH}_{4}$; (ii) $H_{2}O$
B $$Sn + HCl$$
C $$H_{2}/Ni$$
D $$Na(Hg)/C_{2}H_{5}OH$$
E $${Br}_{2}/aq.NaOH$$

Choose the correct Ans. from the options given below.

Options

A.B, D and E only
B.A, C and D only
C.A, D and E only
D.A, B and C only

Solution

Sol. [Key Concept: Reduction of nitriles to primary amines (LiAlH4, H2/Ni, Na (Hg)/EtOH)]

$$\ R - CN\overset{\phantom{Na(Hg)/C_{2}H_{5}OH\ }}{\rightarrow}R - {CH}_{2} - {NH}_{2}$$

$$\ R - CN\underset{\phantom{\text{~}\text{(ii)}\text{~}H_{2}O\ }}{\overset{\phantom{\text{~}\text{(i)}\text{~}{LiAlH}_{4}\ }}{\rightarrow}}R - {CH}_{2} - {NH}_{2}$$

$$\ R - CN\overset{\phantom{Sn + HCl\ }}{\rightarrow}R - CHO$$

$$\ R - CN\overset{\phantom{H_{2}/Ni\ }}{\rightarrow}R - {CH}_{2} - {NH}_{2}$$

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