| 1 | The second question covers the possibility that a person has become tolerant to the effect. | |
| 2 | In this two-step process, alcohol is turned into acetaldehyde , which then becomes acetate. | |
| 3 | Apples and coffee have many common constituents: acetaldehyde, hexanal, hexanoic acid and some esters. | |
| 4 | Glyoxylic acid(Ⅰ) was rapidly synthesized by controlled oxidation of glyoxal(Ⅱ) with oxygen(Ⅲ) in acid medium. | |
| 5 | But those with only one copy can develop a tolerance to acetaldehyde and become heavy drinkers. |