JEE Main 2022 · 26 Jun · Shift 1 · Chemistry Q73

← JEE Main 2022 · 26 Jun · Shift 1

ChemistrySingle correct+4 / -1Question 73 of 90

Given below are two statements :

Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and $\mathrm{Na_2S}$ .

In the light of the above statements, choose the most appropriate answer from the options given below :

Both Statement I and Statement II are correct.

Both Statement I and Statement II are incorrect.

Statement I is correct but Statement II is incorrect.

Statement I is incorrect but Statement II is correct.

Answer and worked solution

Official answer: A

Statement I is correct: with both N and S present, sodium fusion gives NaSCN (blood-red with $\mathrm{Fe^{3+}}$ ).

Statement II is correct: excess sodium decomposes it, $\mathrm{NaSCN+2Na\rightarrow NaCN+Na_2S}$ .

(A)

Topics:Qualitative and quantitative analysis of organic compounds

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JEE Main 2022 · 26 Jun · Shift 1, Chemistry question 73