[carlayajeff1989]

Hi im so confused on my practice chemistry questions so just wondering if anyone can help me solve these two questions as i am lost

thanks


COMPOUND J


             CH3
               |
Cl - CH2 - C - CH2 - CH2 - Cl
               |
             CH3

ii) The number of peaks in the 1H NMR spectrum of J is three??



COMPOUND K


CH3 - C - CH2 - CH2 - C - CH3
        ||                    ||
        O                     O



i) The number of peaks in 13C NMR spectrum of compound K is four?

[Babcock_Hall]

Are those the answers from an answer key, or are they your answers?  If they are your answers, how did you arrive at them?  It is a forum rule that you must show your attempt or your thoughts before we can help you.

[carlayajeff1989]

Are those the answers from an answer key, or are they your answers?  If they are your answers, how did you arrive at them?  It is a forum rule that you must show your attempt or your thoughts before we can help you.

I arrived at them by;
compound J
2 peaks from the Cl groups on either end and one peak from the 2 CH3 groups


compound K
4 peaks as the 2 double c=o bonds

i would love for you to help me with a quick explanation and answers how you got there as i am very lost.


My thoughts have now changed to compound J have 4 peaks as the CH3 bonds therefore being a quartet?
and compound K now three peaks as CH3 bonds centered by CH2s?



many thanks

[Babcock_Hall]

Your terminology is confusing.  The term "quartet" refers to the splitting of lines from J-coupling.  It is a separate concept from how many peaks there are.  How many peaks there are depends on the chemical environment of the hydrogen atoms.  Your discussion does not mention the -CH₂- group next to the quaternary carbon atom.  Have you accounted for those hydrogen atoms?