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Which gives black precipitate on reactio...

Which gives black precipitate on reaction with `CS_2` followed by addition of `HgCl_2` ?

A

`(CH_3)_3 CNH_2`

B

`(C_2 H_5)_2 NH`

C

`(CH_3)_3 N`

D

all the three

Text Solution

Verified by Experts

The correct Answer is:
A
Only `1^@` amines undergo Hofmann Mustard oil reaction and thus give a black ppt. of HgS.
`RNH_2 + CS_2 overset(HgCl_2)to 12 NCS + HgS + 2HCl`
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