In Carius tube, an organic compound 'X' is treated with sodium peroxide to form a mineral acid 'Y'. The solution of $\mathrm{BaCl}_{2}$ is added to 'Y' to form a precipitate 'Z'. 'Z' is used for the quantitative estimation of an extra element. 'X' could be:

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Practical and Analytical Chemistry

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:

(A)Cytosine
(B)Chloroxylenol
(C)A nucleotide
(D)Methionine✓ Correct

Answer: (D)

Solution

The precipitate Z is

BaSO_{4}

, which forms when

BaCl_{2}

reacts with sulfuric acid (Y). This indicates that compound X contains sulfur. Among the options, only methionine (

C_{5} H_{11} NO_{2} S

) contains sulfur. When treated with sodium peroxide in a Carius tube, the sulfur is oxidized to sulfuric acid, which then precipitates as barium sulfate for quantitative estimation.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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