Why is phenol insoluble in NaHCO3

STV Biology Forum

Re: Practice Questions Section 2 - Working Together?

Contribution from Eipos8 ┬╗Mon May 16, 2011 5:29 pm

LillyLangstrumpf wrote:Unfortunately, God, I have more questions that I can't cope with
All course day 7:

14. How can one differentiate between primary, secondary and tertiary alcohols - of course, the Lucas test
Reaction equations and explanations of the respective test procedure for one representative each:
Explanations are of course copied from what is on the top right of p. 11; I get the reaction equation for tert. Alk, sec. Alk and primary alk that has fewer than 6 carbon atoms
BUT what is the reaction equation for a primary alk, with MORE than 6 carbon atoms ?!
They say "it does not dissolve, the aqueous phase remains clear" .....?

18.By which reaction can you differentiate between n-propanol and 1,2 ethanediol? -> Test with the borax
Specify reaction formulas! I just don't know what it should look like
In the script we are only given the reaction of the reagent, BUT not how it reacts with diols, or am I missing something?

24.Which detection reactions are based on the different oxidisability of functional groups?
I thought of the aldehyde tests, i.e. Tollens and Fehling, because the aldehyde can be oxidized to the carbonate, but a ketone cannot.
BUT Are there any other tests based on uschdl oxidizability?

25th and 26th Do you really want to hear only distillation, crystallization, sublimation, selective dissolution and chromatography?
Or is there some way of knowing which of the methods to use for which mixes?

27.How is the position of the absorption frequencies influenced?
What should you write there ?! "Through different functional groups" o.O ^^

29. It is a mystery to me, only with c) it would have to be phenol, because of the blue-violet coloring with FeCl3?

I hope that wasn't too much, but with so many tasks in the script, the questions keep piling up for me
Please help me

25) I checked old exam questions, apparently they want to hear something about solubility and separating funnel, so what you separate how step by step.

In the case of the borax solution, first write the formula where boric acid and 2 OH- are formed, and then the formula where boric acid and the diols (in this case the one specified) form the H3O + ions, a total of 4 boric acids, i.e. 4 H30 +, while only 2 OH- are present -> the solution is acidic, it is discolored.

What would you list in question 28 (describe the processes on which IR spectroscopy is based)? You could write for pages about that, I don't know what exactly you want to hear specifically