Correct pair of compounds which gives blue colouration/precipitate and white precipitate, re- spectively, when their Lassaigne's test separately

Options

A. `NH_(2)NH_(2)HCl " and " ClCH_(2)COOH`
B. `NH_(2)CSNH_(2) " and " phCH_(2)Cl`
C. `NH_(2)CH_(2)COOH " and " NH_(2)CONH_(2)`
D.

Answer

D

Explanation

(D)
(A) `H_2NNH_(2).HCl` do not give white Lassaigne's test as it is not and organic compound
( B) In Lassaigne's test `NH_(2)CONH_(2)` will not give white a red colouration due to the formation of `Fe(CNS)_(3)`
`NH_(2)CONH_(2)` will not give white ppt in Lassaigne's test
(This option is correct )