Do you have a video explaining how to balance the oxidizing agent. E.g. there was a question about hydroxyethanal and it was refluxed. We had to write the equation and the OH and the COH group on hydroxyethanal both became carboxylic acids in the product +H20. I would've put 2(O) because it was reflux but the mark scheme said it was 3(O)
H A I know that question. The primary alcohol is oxidised first to the aldehyde then to the carboxylic acid so 2 oxidations there and a mole of water. The aldehyde can be oxidised once with no water formed. So a total of 3[O] and one water
Do we have to be able to draw the mechanism for the reaction of an 'Alkene to an alcohol' (hydration i'm sure) or is just knowing the process enough? Please reply as soon as possible, thank you.
Just the reaction. They might supply you with extra info (i.e. enough to write the mechanism) and phrase the question as 'suggest the mechanism ....' They've not done this yet
@@MaChemGuy thank you so much for the reply! Do you think changing the oxidising agent for a primary alcohol to become an aldehyde affect the reaction time?
julst129 For A level Chemistry the oxidising agent needs to be a source of dichromate ions acidified with sulfuric acid. Heat always required. There may be other oxidising agents but I’m not aware of any
@@MaChemGuy Thanks again, would it be possible to use potassium permanganate, sodium dichromate, and potassium dichromate as oxidising agents in a distillation setup for ethanol to ethanal?
It's due to the presence of the hydrogen atom attached to the carbon-oxygen double bond in the aldehyde. Ketones don't have that hydrogen. The presence of the hydrogen atom on the carbon-oxygen double bond makes aldehydes very easy to oxidise.
Your a great teacher but one flaw you have is that my mind easily very easily wanders off because it is hard to concentrate as your monotonous. In future vids plz be more louder as well.
Having the molymod structures are proving very helpful for my understanding! Thanks so much for the video
You're very welcome!
Thank you so much for your precious videos
Thank-you so much for your videos. They are a huge help.
+JBT 85 Glad you think so :)
Do you have a video explaining how to balance the oxidizing agent. E.g. there was a question about hydroxyethanal and it was refluxed. We had to write the equation and the OH and the COH group on hydroxyethanal both became carboxylic acids in the product +H20. I would've put 2(O) because it was reflux but the mark scheme said it was 3(O)
H A I know that question. The primary alcohol is oxidised first to the aldehyde then to the carboxylic acid so 2 oxidations there and a mole of water. The aldehyde can be oxidised once with no water formed. So a total of 3[O] and one water
Why is it not possible to oxidise tertiary alcohols?
theinvinsablechicken They are invincible! No it's because they don't have an H on an adjacent C from the OH carbon to make water
Do we have to be able to draw the mechanism for the reaction of an 'Alkene to an alcohol' (hydration i'm sure) or is just knowing the process enough? Please reply as soon as possible, thank you.
Just the reaction. They might supply you with extra info (i.e. enough to write the mechanism) and phrase the question as 'suggest the mechanism ....' They've not done this yet
Without heat would no reaction occur for primary alcohols?
julst129 Would be very slow
@@MaChemGuy thank you so much for the reply! Do you think changing the oxidising agent for a primary alcohol to become an aldehyde affect the reaction time?
julst129 For A level Chemistry the oxidising agent needs to be a source of dichromate ions acidified with sulfuric acid. Heat always required. There may be other oxidising agents but I’m not aware of any
@@MaChemGuy Thanks again, would it be possible to use potassium permanganate, sodium dichromate, and potassium dichromate as oxidising agents in a distillation setup for ethanol to ethanal?
Acidified sodium and potassium dichromate are definitely fine. Acidified potassium permanganate should also work.
Why can an aldehyde be oxidised, but a ketone can't?
It's due to the presence of the hydrogen atom attached to the carbon-oxygen double bond in the aldehyde. Ketones don't have that hydrogen. The presence of the hydrogen atom on the carbon-oxygen double bond makes aldehydes very easy to oxidise.
Leila Zharmenova I’ll try
Your a great teacher but one flaw you have is that my mind easily very easily wanders off because it is hard to concentrate as your monotonous. In future vids plz be more louder as well.