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How is ethanamine prepared from (i) nitroethane, (ii) ethanenitrile, (iii) acetamide, (iv) ethyl bromide?

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How is ethanamine prepared from (i) nitroethane, (ii) ethanenitrile, (iii) acetamide, (iv) ethyl bromide?

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(i) Reduction of nitroethane using H2 in the presence of Ni or Sn/HCl or Pd/H2.

(ii) Reduction of ethanenitrile using sodium amalgam in ethanol.

(iii) Reduction of acetamide using LiAlH4.

(iv) By Gabriel’s phthalimide synthesis.

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