# Write the equations to show how lactic fermentation compares with alcoholic fermentation. Which reactant(s) do they have in common? a) Lactic fermentation: $C_{6} H_{12} O_{6} \rightarrow 2 C_{3} H_{6} O_{3}$ (glucose $\leftarrow$ lactic acid) Alcoholic fermentation: $C_{6} H_{12} O_{6} \rightarrow 2 C_{2} H_{5} O H+ 2 C O_{2}$ (glucose $\leftarrow$ ethanol + carbon dioxide) Both types of fermentation share glucose as a common reactant. b) Lactic fermentation: $C O_{2}+H_{2} O \rightarrow C_{3} H_{6} O_{3}$ (carbon dioxide + water $\leftarrow$ lactic acid) Alcoholic fermentation: $C O_{2}+H_{2} O \rightarrow C_{2} H_{5} O H$ (carbon dioxide + water $\leftarrow$ ethanol) They both have carbon dioxide and water in common as reactants. c) Lactic fermentation: $C_{6} H_{12} O_{6} \rightarrow C_{2} H_{5} O H$ (glucose $\leftarrow$ ethanol) Alcoholic fermentation: $C_{6} H_{12} O_{6} \rightarrow C_{3} H_{6} O_{3}$ (glucose $\leftarrow$ lactic acid) They have glucose and ethanol in common as reactants. d) Lactic fermentation: $C_{6} H_{12} O_{6}+O_{2} \rightarrow C_{3} H_{6} O_{3}$ (glucose + oxygen $\leftarrow$ lactic acid) Alcoholic fermentation: $C_{6} H_{12} O_{6}+O_{2} \rightarrow C_{2} H_{5} O H+C O_{2}$ (glucose + oxygen $\leftarrow$ ethanol + carbon dioxide) They both share oxygen as a common reactant.
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Step 1
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Step 2
: Analyze the Fermentation Equations

Alcoholic Fermentation: $$C_{6}H_{12}O_{6} \rightarrow 2C_{2}H_{5}OH + 2CO_{2}
Let's carefully examine the equations for lactic and alcoholic fermentation:

Final Answer

Glucose (C_{6}H_{12}O_{6}) is the common reactant in both lactic and alcoholic fermentation.