In Carius tube, an organic compound ‘X’ is treated with sodium peroxide to form a mineral acid ‘Y’. The solution of BaCl2, is added to ‘Y’ to form a precipitate ‘Z’. ‘Z’ is used for the quantitative e

Question

In Carius tube, an organic compound ‘X’ is treated with sodium peroxide to form a mineral acid ‘Y’. The solution of BaCl2, is added to ‘Y’ to form a precipitate ‘Z’. ‘Z’ is used for the quantitative estimation of an extra element. ‘X’ could be

(A) A nucleotide
(B) Chioroxylenol
(C) Methionine
(D) Cytosine

Prashant Kotian · Accepted Answer

Correct answer: C. Methionine has 'S', and 'S' with fuming HNO3 get oxidised to SO42– ion, which gives while ppt with BaCl2. H3C –S – CH2 – CH2 –CH – COO– NH3 + Methionine

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