For the test of specific elements in an organic compound, the Lassaigne extract is boiled with fresh aqueous iron (II) sulphate [FeSO4] and acidified with conc. H2SO4. Appearance of :(i) blue colour shows the presence of X and(ii) blood red colour shows the presence of Y and Z both.
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a
b
c
d
answer is B.
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Detailed Solution
Fe2+⟶H+Fe3++e-; 6CN-+Fe2+⟶Fe(CN)64-3Fe(CN)64-+4Fe3+⟶Fe4III[FeII(CN)6]3Prussian blue (X)Fe3++3CNS−→FeCNS3Blood red (Y and Z)