Passage: Consider the following reaction sequence in which J , K , L and M are the major products. Given: Atomic mass (in amu): H : 1 , C : 12 , N : 14 , O : 16 , S : 32 , Br : 80 , Ba : 137 Question: In sulphur estimation by Carius method,

Question

Passage: Consider the following reaction sequence in which J , K , L and M are the major products. Given: Atomic mass (in amu): H : 1 , C : 12 , N : 14 , O : 16 , S : 32 , Br : 80 , Ba : 137 Question: In sulphur estimation by Carius method, the amount of BaS O₄ formed from 3.79 g of M is ____ g.

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The starting material is m -xylene (1,3-dimethylbenzene). It undergoes Friedel-Crafts acylation with chloroacetyl chloride ( ClCH ₂ COCl ) in the presence of anhydrous AlCl ₃ to form 2-chloro-1-(2,4-dimethylphenyl)ethanone. The chloro ketone reacts with NaI (Finkelstein reaction) to form 2-iodo-1-(2,4-dimethylphenyl)ethanone. This iodo compound undergoes Williamson ether synthesis with sodium 3-nitrophenoxide to form compound J . The molecular formula of J is C ₁₆ H ₁₅ NO ₄ . Compound J is reduced by NaBH ₄ , which

Passage: Consider the following reaction sequence in which J , K , L and M are the major products. Given: Atomic mass (in amu): H : 1 , C : 12 , N : 14 , O : 16 , S : 32 , Br : 80 , Ba : 137 Question: In sulphur estimation by Carius method, the amount of BaS O₄ formed from 3.79 g of M is ____ g.

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