NEET PYQ Bank: Organic Chemistry – Fundamental Principles & Techniques

Q 1 :
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of [2023]

${[F e {(C N)}_{5} N O S]}^{4 -}$
${[F e (S C N)]}^{2 +}$
$F e_{4} {[F e {(C N)}_{6}]}_{3} \cdot x H_{2} O$
NaSCN

(2)

In case, nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed. It gives blood red colour and no Prussian blue since there are no free cyanide.

$Na + C + N + S ⟶ NaSCN$

${Fe}^{3 +} + {SCN}^{-} ⟶ \underset{Blood red}{{[Fe (SCN)]}^{2 +}}$

Topic Question Set

Q 1 :
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of [2023]

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Topic Question Set

Q 1 : In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe3+ due to the formation of [2023]

Want Us to Email you About Special Offers & Updates?

Q 1 :
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of [2023]