Ketones Saturation: Acetone CH3COCH3

[Nader AbdlGhani]

Are ketones saturated ? for example , Acetone ( CH₃COCH₃ ) my question is aroused by a question in the General Secondary Education Certificate Chemistry exam here in Egypt , as the question there was : How many moles of hydrogen molecules are required to react with one mole of : 1) Acetone. 2) Biphenyl. to obtain a saturated compound , the problem is with the Acetone not the Biphenyl of course .

 

[Borek]

I would not apply term "saturated" to other bonds than carbon-carbon ones (so I would consider acetone to be saturated). That doesn't stop it from reacting with hydrogen and producing a saturated alkane.

 

[Nader AbdlGhani]

I would not apply term "saturated" to other bonds than carbon-carbon ones (so I would consider acetone to be saturated). That doesn't stop it from reacting with hydrogen and producing a saturated alkane.

That's what has come in my mind during the exam , and I wrote 0 hydrogen moles , but when I saw the ministry of education's official model answer they wrote 1 mole for acetone and 6 moles for diphenyl , and won't it (acetone) form secondary alcohol when it reacts with hydrogen ?

 

[Borek]

I think the question is a bit confusing. At the same time the answer given is hardly incorrect - secondary alcohol is a saturated compound, so 1 mole is enough.

 

[Nader AbdlGhani]

I think the question is a bit confusing. At the same time the answer given is hardly incorrect - secondary alcohol is a saturated compound, so 1 mole is enough.

So the last answer is ? and can I know what is your educational background ?

 

[Ygggdrasil]

When going from a chemical formula (e.g. CH3COCH3) to a structural formula, it is often useful to calculate the degree of unsaturation, which tells you how many pi bonds/rings are present in the compound. Acetone has a degree of unsaturation of 1, indicating that there is one double bond or ring in the molecule.

 

[Nader AbdlGhani]

When going from a chemical formula (e.g. CH3COCH3) to a structural formula, it is often useful to calculate the degree of unsaturation, which tells you how many pi bonds/rings are present in the compound. Acetone has a degree of unsaturation of 1, indicating that there is one double bond or ring in the molecule.

Well , thanks but that's so confusing ...