4. HCHO + KMNO4 +_(4a)_ → _(4b)_+ K2SO4 +| MnO24 + H2O 5. CH3CH2ONA + CH3CH2B1 15) + NaBr. 6. _(6a)__+ 2CUSO4. + 4NAOH → CH3COOH ± _(6b)__ + 2Na2SO4. + H2O

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