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Question

Which of the following method(s) does work for the preparation of secondary amine?

A
R3N(i)BrCN−−−−−(ii)H3O+(iii)Δ?
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B
RO||CNHRLiAlH2−−−?
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C
RNCNl/H2−−−Δ?
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D
All of these
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Solution

The correct option is D All of these
(A) Tertiary amines react with cyanogen bromide to form a dialkylcyanamide which, on hydrolysis, gives a secondary amine.

R3N+BrCN[R3NCN]+BrRBr+R2NCNH+R2NH

(B) Secondary amides (RCONHR) react with lithium aluminium hydride (LiAlH4) to form secondary amines (RCH2NHR)

RO||CNHR+HAlH3RO|C=NRRCH2NHR

(C) Secondary amines are produced by the reduction of isocynaide.

RNCNi/H2RNHCH3

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