MrOhms2
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Hi
We did a chemistry lab and have some questions after to submit and I’m really stuck and baffled one a few of them so I’d really appreciate some help and guidance.

5.Is the 2-nitrobenzaldehyde used in this experiment an example of an ortho or para substituted benzene molecule? What does this mean? Why is it important with respect to this experiment?

17. What is the structure of indigo?

16. Describe how indigo dye is fast, and show the leuco and leucoindigo reduction and oxidation process.

25. Cotton fibers are composed of the cellulose polymer (Figure 1.c). Explain why indigo adheres to the cotton fabric so effectively, describing the intermolecular forces involved.

19. Give the common name and draw the structure of another example of an organic dye and state a use for organic dyes other than for colouring fabrics.
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cephid
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Ortho means next to and para opposite (there is also meta which next but one, but you don't need to worry about that here).

Have a search on the web for indigo as I guess that is what you are making. Why does the reaction use o-nitrobenzaldehyde and not p-nitrobenzaldehyde? Look at the structure of indigo, could it be made with both o- and p- nitrobenzaldehydes? If not, why not? Again look at the structure and see if you can understand what the molecules are doing when they react together.and then you might be able to find the reason and explain your practical.
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