A) \[{{O}_{2}}\]is used, \[C{{O}_{2}}\]is not liberated
B) \[{{O}_{2}}\]is not used, \[C{{O}_{2}}\]is liberated
C) \[C{{O}_{2}}\]is used, \[C{{O}_{2}}\]is liberated
D) neither \[{{O}_{2}}\]is used, nor \[C{{O}_{2}}\]is liberated
Correct Answer: D
Solution :
Lactic acid fermentation occurs in lactic acid bacteria and muscles. During this, neither oxygen is used nor carbon dioxide is liberated. It produces ethanol or lactic acid, propionic acid, butyric acid, acetate and methane. \[\underset{(Lactose)}{\mathop{{{C}_{12}}{{H}_{22}}{{O}_{11}}}}\,+{{H}_{2}}O\xrightarrow[{}]{{}}\underset{(Glucose)}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,+\underset{(Glucose)}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\] \[\underset{(Hexose)}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\xrightarrow[{}]{{}}\underset{(Lactic\,acid)}{\mathop{2{{C}_{3}}{{H}_{6}}{{O}_{3}}}}\,\]
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