The most appropriate reagent for conversion of \(\mathrm{C_2H_5CN}\) into \(\mathrm{CH_3CH_2CH_2NH_2}\) is
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- \(\mathrm{NaBH_4}\)
- \(\mathrm{CaH_2}\)
- \(\mathrm{Na(CN)BH_3}\)
- \(\mathrm{LiAlH_4}\)
The Correct Option is D
Solution and Explanation
\(\mathrm{NaBH_4}\) is too mild to reduce a nitrile; \(\mathrm{CaH_2}\) is only a drying agent/base; \(\mathrm{Na(CN)BH_3}\) (sodium cyanoborohydride) is even milder (reduces imines, not nitriles).
\(\mathrm{LiAlH_4}\) is a strong reducing agent and reduces nitriles to primary amines: \(\mathrm{CH_3CH_2CN} + 4[\mathrm{H}] \rightarrow \mathrm{CH_3CH_2CH_2NH_2}\).
Answer: (4) \(\mathrm{LiAlH_4}\)
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