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

Question

Correct pair of compounds which gives blue colouration/precipitate and white precipitate, respectively, when their Lassaigne’s test is separately done is (A) NH2 NH2.HCl and ClCH2COOH (B) NH2CSNH2 and PhCH2Cl (C) NH2CH2COOH and NH2CONH2 (D)

Tardigrade Admin · Accepted Answer

+na xrightarrowΔ sodium extract (NaCN) xrightarrow[FeCl3]FeSO4 underset textPrussion blueFe 4[ Fe ( CN )6]3

+Na xrightarrowΔ sodium extract (NaCl) xrightarrowAgNo3 underset textWhite Precipetate AgCl downarrow+ NaNO 3 Hydrozine, NH 2 ⋅ NH 2 does not respond Lassaigne's test because it does not contain any carbon and hence, NaCN is not formed. Compound, NH2 - underset overset||SC -NH2 N and S, hence, it will give red colour in Lassaigne test.

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

$N H_{2} N H_{2} . H Cl$ and $ClC H_{2} COO H$

$N H_{2} CSN H_{2}$ and $P h C H_{2} Cl$

$N H_{2} C H_{2} COO H$ and $N H_{2} CON H_{2}$

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

NH2​NH2​.HCl and ClCH2​COOH

NH2​CSNH2​ and PhCH2​Cl

NH2​CH2​COOH and NH2​CONH2​

$N H_{2} N H_{2} . H Cl$ and $ClC H_{2} COO H$

$N H_{2} CSN H_{2}$ and $P h C H_{2} Cl$

$N H_{2} C H_{2} COO H$ and $N H_{2} CON H_{2}$