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Question

PhCH2CH=C|MePh(i)O3−−−(ii)H2OU+V
U+VNaHSO3 Only U precipitates out.
VRedP/Br2−−−−−H2OW

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Solution

PhCH2CH=C|MePhO3H2OPhCH2COOH+MeO||CPh
Reaction is oxidation ozonalysis
U+VNaHSO3−−−−U precipitate out
Therefore , U is MeO||CPh as only ketons undergo NaHSO3 addition
PhCH2COOHRedP/Br2−−−−−H2OPhBr|C|HCOOH
This reaction is known as Hell-Volhard-Zelinsky-reaction [HVZ]

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