Let's study Chemistry 10

Chemistry Level 3

An organic compound A is taken and fused with sodium metal and this extract is then added iron (II) sulphate and then acidified with concentrated sulphuric acid and it give 'blood red' colour.

Which of the following can be A?

R-cysteine, an amino acid Sulfur mustard,chemical warfare agent Diphenyl disulfide Allicin

Aryan Goyat by aryan goyat , 22, India

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2 solutions

Chew-Seong Cheong
Feb 14, 2016

The test described in the problem is Lassaigne's test or fused sodium test. The blood red coloration indicates the presence of both sulfur S \ce{S} and nitrogen N \ce{N} in the organic compound A \ce{A} . Out of the four options:

  • Allicin R − S ( O ) − S − R \ce{R-S(O)-S-R}
  • Sulfur mustard C X 4 H X 8 C l X 2 S \ce{C4H8Cl2S}
  • R-cysteine C X 3 H X 7 N O X 2 S \ce{C3H7NO2S}
  • Diphenyl disulfide C X 12 H X 10 S X 2 \ce{ C12H10S2}

only R-cysteine \boxed{\text{R-cysteine}} C X 3 H X 7 N O X 2 S \ce{C3H7NO2S} has both S \ce{S} and N \ce{N} .

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nicely presented solution sir!

aryan goyat - 5 years, 4 months ago

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Thanks. Nice that you like the solution. Up-vote?

Chew-Seong Cheong - 5 years, 4 months ago

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Oh!Sorry will up-vote it now.

aryan goyat - 5 years, 4 months ago
Aryan Goyat
Feb 12, 2016

the compound must contain both sulphur and nitrogen.Check the options from here .

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