Which of the following methods is used to check the purity of an organic compound?

  • A
    Chromatography
  • B
    Spectroscopy
  • C
    Both $A$ and $B$
  • D
    Neither $A$ nor $B$

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Lassaigne's test for nitrogen is negative for which compound?

Statement $I$: Nitrogen in pyridine cannot be estimated by Kjeldahl’s method. Statement $II$: Nitrogen in pyridine changes to ammonium sulphate when heated with conc. $H_2SO_4$ in Kjeldahl’s method. Read the above given statements and choose the correct answer from the given options.

Which of the following nitrogen-containing compounds does not give Lassaigne's test?

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