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How will you synthesise acetaldehyde fro...

How will you synthesise acetaldehyde from formaldehyde ?

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`underset("formaldehyde")(H-overset(O)overset(||)C-H)overset(CH_(3)MgBr) underset(H_(2)O //H^(+))rarr underset("ethyl alcohol")(CH_(3)CH_(2)OH) overset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4))rarr underset("acetaldehyde")(CH_(3)CHO)`
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