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Compounds (A) and (B) on reaction in eth...

Compounds (A) and (B) on reaction in ether medium and subsequent acidification and oxidation give 2,5-dimetylhexan-3-one. What are (A) and (B) ?

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`CH_(3)-underset((A) "and "(B))underset(CH_(3))underset(|)(CHMgBr)+CH_(3)-underset(CH_(3))underset(|)CHCH_(2)CHO overset("ether")(to)`
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