1. Which of the carbon atoms in the following molecule appears furthest downfiel

Question

1. Which of the carbon atoms in the following molecule appears furthest downfield in the 13C NMR spectrum?

(CH3)2CH2COCH3 CH3=i CH2=ii CO=iii CH3=iv

just answer with i, ii, iii, iv please..

2. Which of the protons in the following molecule appear at the highest delta-value in 1NMR spectrum?

(CH3)2CHCH2COOH CH3=i CH=ii CH2=iii OH=iv

3. Which feature in the 1H NMR spectrum provides information about the relative numnber of each kind of proton in a molecule?

a. Multiplicity b. Chemical shift c.number of signals d. integral

4. Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet, triplet and pentet?

a. CH3OCH2CH2OCH2CH3 b.CH3OCH2CH2CH2OCH3 c.CH3OCH2CH2CH2CH2OH d.CH3OCH2CH(CH3)OCH3

Explanation / Answer

1) iii

2) iv

3) d

4) c

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