The female pheromone of flies can be obtained by anodic oxidation of erucic acid (from white mustard) and carboxylic acid X in concentrated NaOH solution. The total electrolytic reaction formula is C2

The female pheromone of flies can be obtained by anodic oxidation of erucic acid (from white mustard) and carboxylic acid X in concentrated NaOH solution. The total electrolytic reaction formula is C2 1H4. A, according to the atomic conservation, X is C2H5COOH, so A is correct;

B, when electrolysis is carried out in concentrated NaOH solution, it is impossible to get hydrogen ions, so B is wrong;

C, in the process of electrolysis, 1mol of female pheromone is produced for every 2mol of electrons transferred, so c is wrong;

D, the cathode is hydrogen ion discharge, and the reduction product is hydrogen, so D is wrong.

So choose a.