why not?

[prsndwg]

Hi,
Can someone explain why the answer is not choice C and its Choice A instead??

 

[prsndwg]

What about this one?

I thought it was two singlets and 2 doublets.. but i guess not😕

 

[toooth]

What about this one?

I thought it was two singlets and 2 doublets.. but i guess not😕

I think The answer should be E-two singlets. since this compound has symmetry, all the carbons in the ring will be considered as one while being next to the carbon which has no hydrogens on it-the one with the methyl, which would give a singlet. Also, the methyl itself would be the other singlet since it is adjacent to the same carbon mentioned above.
I hope thats correct

 

[NumbaOneStunna]

For the acid problem what I gathered was when you're giving x% acid it's referring to the mass fraction not volume fraction of the acid in water.

 

[prsndwg]

I think The answer should be E-two singlets. since this compound has symmetry, all the carbons in the ring will be considered as one while being next to the carbon which has no hydrogens on it-the one with the methyl, which would give a singlet. Also, the methyl itself would be the other singlet since it is adjacent to the same carbon mentioned above.
I hope thats correct

Now i get it..
another Q.. If this was 13C NMR how many would that be? would it be 4 singlets?

 

[prsndwg]

:-?