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An ester 'A' (C(4)H(8)O(2)) on treatment...

An ester 'A' `(C_(4)H_(8)O_(2))` on treatment with excess methyl magnesium chloride followed on acidification gives an alcohol 'B' as the sole organic product. Alochol 'B' as the organic product. Alcohol 'B' on oxidation with NaOCl followed by acidification gives acetic acid. Deduce structure of A and B. Show the reactions involved.

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Esters on treatment with methyl magnesium chloride will give either secondary alcohol or tertiary alcohol. As `3^(@)` alcohols are not easily oxidised hence it must be a secondary alcohol and ester must be an alkyl formate. The various reactions involved are
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