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Question

In which of the following reactions the final product will give a black precipitate of HgS when treated with CS2 followed by HgCl2?

A
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B
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C
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D
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Solution

The correct option is D
10 amines will give a positive for the mustard oil test giving a black precipitate of HgS.

(a)

(b)

(c)

(d)
In (d) only a 1o amine is formed.

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