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CBSE Class 11-science Answered

What is the path of a redox reaction? In photosynthesis by using H2O(18) {O-18 isotope in H2O} how can we find path of reaction? Please help
Asked by govtsecschoolnayaganv051 | 05 Sep, 2018, 01:32: PM
answered-by-expert Expert Answer
The path of reaction is the described as the cycle of reactions with intermediate reactions to give the final product.
Usually refers as a reaction coordinate diagram or cycle associated with reactions.
 
Photosynthesis:
6 CO subscript 2 space plus space 6 straight H subscript 2 straight O space rightwards arrow with light on top space space straight c subscript 6 straight H subscript 12 straight O subscript 6 space plus space 6 straight O subscript 2
 
During photosynthesis, carbon dioxide and water react in presence of sunlight to give glucose and oxygen.
 
Now the question is the oxygen comes from whether CO2 or H2O. To find the answer, there are two tests have been taken.
 
First experiment: In this heavy water (H2O18) or isotope-labeled water is used to water the plant and unlabeled CO2 was provided. It is found that the oxygen released from the plant during photosynthesis is 18O2 labeled-oxygen.
 
Second experiment: 
In this unlabeled water is used to water the plant and labeled C18O2 was provided. It is found that the oxygen released from the plant during photosynthesis is O2 unlabeled-oxygen.
 
Conclusion: From both of these experiments it is concluded that the oxygen released during photosynthesis comes from water.
 
Answered by Ramandeep | 06 Sep, 2018, 06:52: PM
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