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Question

Which of the following reactions are suitable for the preparation of primary amines?

A
Action of ammonia on alkyl halides
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B
Hofmann rearrangement
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C
Gabriel synthesis
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D
Hydrogenation of isocyanides
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Solution

The correct option is C Gabriel synthesis
(a) Action of NH3 on RX will lead to formation of mixture of product including 1o, 2o, 3o and quaternery amines.

(b) Hoffmann bromamide reaction produces primary amines.
RO||CNH2Br2−−KOHRNH2(1o amine)

(c) Gabriel's phthalimide synthesis is used for the preparation of primary amines.

(d) RNCH2/Pt−−−RNHCH3(2o amine)

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