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Amongst the given set of reactants, the most appropriate for preparing \( 2^{\circ} \) amine is
(i) \( 2^{\circ} \mathrm{R}-\mathrm{Br}+\mathrm{NH}_{3} \)
(ii) \( 2^{\circ} \mathrm{R}-\mathrm{Br}+\mathrm{NaCN} \) followed by \( \mathrm{H}_{2} / \mathrm{Pt} \)
\( \mathrm{P} \)
(iii) \( 1^{\circ} \mathrm{R}-\mathrm{NH}_{2}+\mathrm{RCHO} \) followed by \( \mathrm{H}_{2} / \mathrm{Pt} \)
(iv) \( 1^{\circ} \mathrm{R}-\mathrm{Br}(2 \mathrm{~mol})+ \) potassium phthalimide followed by \( \mathrm{H}_{3} \mathrm{O}^{+} / \)heat
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