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In Carius tube, an organic compound ‘X’ is treated with sodium peroxide to form a mineral acid ‘Y’. The solution of BaCl 2 is added to ‘Y’ to form a precipitate ‘Z’. ‘Z’ is used for the quantitative estimation of an extra element. ‘X’ could be -

1. Cytosine
2. A nucleotide
3. Methionine
4. Chloroxylenol

Correct answer: Methionine

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