In which of the following reactions the final product will give a black precipitate of HgS when treated with $C S_{2}$ followed by $H g C l_{2}$ ?

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Solution

The correct option is D
$1^{0}$ amines will give a positive for the mustard oil test giving a black precipitate of $H g S$ .

(a)

(b)

(c)

(d)
In (d) only a $1^{o}$ amine is formed.

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