9. Amongst the given set of reactants, the most appropriate for preparing \( 2^{\circ} \) amine is
(a) \( 2^{\circ} R - Br + NH _{3} \)
(b) \( 2^{\circ} R - Br + NaCN \) followed by \( H _{2} / PH \)
(c) \( 1^{\circ} R - NH _{2}+ RCHO \) followed by \( H _{2} / Pt \)
(d) \( 1^{\circ} R - Br (2 mol )+ \) potassium phthalimide followed by \( H _{3} O ^{+} \)/heat