Question

Fermentation invariably leads to the formation of :

• A. ethyl alcohol
• B. methyl alcohol
• C. carbon dioxide
• D. acetic acid

Answer 1

The correct option is A ethyl alcohol

Fermentation is the name given to the process where a sugar (glucose) solution containing yeast is turned into alcohol (ethanol). The balanced equation for fermentation is :
glucose -----> ethanol + carbon dioxide
$C_6{H}_{(}12\left)O_6\right(aq)\to 2C_2{H}_{5}OH+2C{O}_2(g)$
The carbon dioxide gas bubbles out of the solution leaving a mixture of ethanol and water. Fermentation must be carried out in the absence of air to make ethanol. If air is present, ethanoic acid is made instead of ethanol. Yeast is a microorganism containing an enzyme which acts as a catalyst.