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Correct pair of compounds which gives bl...

Correct pair of compounds which gives blue colouration/precipitate and white precipitate, respectively, when their Lassaigne's test is separately done is

A

`NH_(2)NH_2HCl` and `ClCH_2COOH`

B

`NH_2 CSNH_2 and PhCH_2Cl`

C

`NH_2 CH_2 COOH and NH_2 CONH_2`

D

Text Solution

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The correct Answer is:
D
`NH_(2)NH_2` HCl does not contain C and hence does not give blue colour in Lassaigne.s test, `NH_2CSNH_2` contains both N and S and hence gives red colour in Lassaigne.s test. `NH_2CONH_2` does not contain CI and hence does not give white ppt. Thus, `C_6 H_5` NHMe contains Nand hence gives blue colour while `o-C_6H_4` (CI)COOH contains Cl and thus gives white ppt. in Lassaigne.s test.
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BRILLIANT PUBLICATION-PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS-LEVEL- II
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