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BITSAT 2018
Exam
BITSAT
Year
2018
Subject
Chemistry
Chapter
General Organic Chemistry

BITSAT 2018 · Chemistry · General Organic Chemistry

Which of the following compound will give blood red colour while...

Which of the following compound will give blood red colour while doing the Lassaigne's test for NN.

Options

  1. A(NH2)2C=O{\left({NH}_{2}\right)}_{2}C = O
  2. B

    H2N(C6H4)SO3H{H}_{2}N\left({C}_{6}{H}_{4}\right){SO}_{3}H

  3. CC6H5SO3H{C}_{6}{H}_{5}{SO}_{3}H
  4. DCHCl3{CHCl}_{3}

Correct answer

B.

H2N(C6H4)SO3H{H}_{2}N\left({C}_{6}{H}_{4}\right){SO}_{3}H

Step-by-step solution

When nitrogen and sulphur both are present in the organic compound, they combine during fusion to form sodium thiocyanate (sulphocyanide).

Thus, the compounds containing both NN and SS give blood red colour in Lassaigne's test due to the formation of Fe(SCN)2Fe{\left(SCN\right)}_{2}. Thus, H2N(C6H4)SO3H{H}_{2}N\left({C}_{6}{H}_{4}\right){SO}_{3}H gives blood red colour in Lassaigne's test of nitrogen.

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