an aldehyde + A + H2O => a carboxylate + AH2 + H(+)
an aldehyde + a + h2o => a carboxylate + ah2 + h(+)
an aldehyde + A + H2O => a carboxylate + AH2 + H(+)
an aldehyde + a + h2o => a carboxylate + ah2 + h(+)