how is ethanol prepared from methanal by using grignard reagent
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Explanation:
Methanal reacts with methyl magnesium iodide in presence of dry ether to give a complex which on acid hydrolysis gives ethanol.
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Reaction for preparation is given below-
Methanal is aldehyde and ethanol is alcohol. To prepare alcohol from carbonyl compounds, Grinard reagent can be used. It forms secondary alcohols with aldehydes.
Grinard reagent is an alkyl magnesium halide. Methanal reacts with Grinard reagent to form ethoxymagnesium chloride adduct.
Further it reacts with water to give ethanol. Reaction is given below-
HCHO + CH3MgCl --> CH3CH2OMgCl
CH3CH2OMgCl + H2O --> C2H5OH
HCHO - Methanal
CH3MgCl - Grinard Reagent/Methyl magnesium chloride
CH3CH2OMgCl - ethoxymagnesium chloride
H2O - Water
C2H5OH - Ethanol
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