Which of the following compounds gives a 1H NMR spectrum consisting of only a si

Question

Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet? a) 1-bromopropane b) 2,2-dibromopropane c) 1,1-dibromopropane d) 1,3-dibromopropane Which of the following compounds gives a DEPT-90 spectrum consisting of one signal and a DEPT-135 spectrum consisting of three positive peaks and one negative peak (ie - below the baseline)? a) CH3CH2CH2Ch3 b) C(CH3CH3)4 c) (CH3)2CHCH2CH3 d) (CH3)2CHCH(CH3)2 How many kinds of non-equivalent protons are there in 2-methylpentane? a) 3 b)4 c)6 d)5 What is the ratio of thei ntensity of peaks in a sextet in the 1H NMR spectrum? a) 1:5:10:10:5:1 b) 1:4:8:8:41 c) 1:2:33:2:1 d) 1:3:6:6:41

Explanation / Answer

1) b) 2,2 dibromopropane

2) c) (CH3)2 CH CH2 CH3

3) c) 6

4) d) 1:3:6:6:4:1

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