In alcohol fermentation,

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(B) In alcohol fermentation,glucose is broken down into $2$ molecules of pyruvic acid through glycolysis,producing $NADH + H^+$. In the subsequent ste

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Triose phosphate is the electron donor while acetaldehyde is the electron acceptor

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(B) In alcohol fermentation,glucose is broken down into $2$ molecules of pyruvic acid through glycolysis,producing $NADH + H^+$. In the subsequent steps,pyruvic acid is converted into acetaldehyde,which then acts as the final electron acceptor. Acetaldehyde accepts electrons from $NADH + H^+$ (which originated from the oxidation of triose phosphate) to be reduced into ethanol. Therefore,triose phosphate acts as the electron donor (indirectly via $NADH$) and acetaldehyde acts as the electron acceptor.

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