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 answer from the options given below :

(B) A, C and D only
Nitriles ( \(R - CN\) ) can be reduced to primary amines ( \(R - CH _2 NH _2\) ) using strong reducing agents or catalytic hydrogenation.
Reagent A: \(LiAlH _4\) followed by hydrolysis is a strong reducing agent that reduces nitriles to primary amines.
Reagent C : \(H _2 / Ni\) (catalytic hydrogenation) reduces nitriles to primary amines.
Reagent D: \(Na ( Hg ) / C _2 H _5 OH\) (Mendius reduction) provides nascent hydrogen and reduces nitriles to primary amines.
Reagent B : \(Sn + HCl\) is typically used to reduce nitro compounds to amines. (Note: \(SnCl _2+ HCl\) is used in Stephen reduction to convert nitriles to aldehydes).
Reagent E : \(Br _2\) /aq. NaOH is used for Hoffmann bromamide degradation to convert amides to primary amines, not nitriles.
Thus, A, C, and D are the correct reagents.