how can we convert ethanal to methanal ,,,,,,,,,,,,,,,,,,,,pls give example also ,according to plus two class
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CH3CHO→(K2Cr2O2/H2SO4) CH3COOH→(NH3 excess,-NH4^+→CH3COONH4→(Heat -H2O)→CH3CONH2→(Br2/KOH)CH3NH2→(HNO2,-N2,-H2O)CH3OH→(PCC Pyridinium chlorochromate)HCHO.
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