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FrontierScience / 4842f95d-b84a-4ff4-8165-64fc7bfcf00d / B1 reacts with aqueous bromine (Br2) to form B2. B2 reacts with potassium…

Problem

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problem

B1 reacts with aqueous bromine (Br2) to form B2. B2 reacts with potassium nitrite (KNO2) to form B3. B3 is nitrated in nitric acid (HNO3) and sulfuric acid (H2SO4) to form B4.

- B1 contains a monosubstituted aromatic 5-membered heterocycle and has a molar mass of 96.08 g/mol. It may be produced by dehydrating 5-carbon sugars (e.g. xylose) in an acid catalyst.
- B2 has the molecular formula C4H2Br2O3 and contains a tetrasubstituted alkene with 2 substituents being bromines cis to each other.
- B3 is a dipotassium salt with a molar mass of 269.27 g/mol. It contains 1 hydrogen.
- B4 is an achiral pseudohalogen dimer with 2 carbons, no hydrogens and a molar mass of 300. g/mol.

When B4 decomposes in solution, it forms an intermediate B5 and 1 equivalent of dinitrogen tetroxide (N2O4) as a side product. Intermediate B5 can be trapped and detected as a Diels-Alder adduct.

Provide the structures of B1, B2, B3, B4, and B5 in the following format, "B1: X; B2: X; B3: X; B4: X; B5: X"

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subject

chemistry

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Source and history

upstream_id / Original problem ID: 4842f95d-b84a-4ff4-8165-64fc7bfcf00d
task_id: 6afa4a6c-3dbc-5313-bada-532cb4a5ee5c
task_key: olympiad--test--4842f95d~2db84a~2d4ff4~2d8165~2d64fc7bfcf00d
task_revision_id: 1
config / split: olympiad / test

Official source

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