1) How many kinds of chemically and magnetically nonequivalent hydrogen nuclei a

ID: 525863 • Letter: 1

Question

1) How many kinds of chemically and magnetically nonequivalent hydrogen nuclei are there in ethylbenzene?

a) 3

b) 4

c) 7

d) 5

e) 6

2) What is the splitting pattern expected for the protons in the molecule CH3CH2-O-CH3?

a) singlet

b) doublet

c) triplet

d) quartet

e) nonet (9 peaks)

3) What is the multiplicity of the -OH peak of ethanol that contains a trace amount of acid?

a) quintet

b) singlet

c) triplet

d) quartet

e) doublet

4) Which of the following mass spectral phenomena would indicate the presence of an odd number of nitrogen atoms in a molecule?

a) the molecular ion peak had an odd number for its m/z ratio

b) the molecular ion peak had an even number for its m/z ratio

c) the molecular ion peak is also the base peak

d) the molecular ion peak is missing from the spectrum

e) none of the above

1.(d) 5

2. (d) quartet

This is explained by multiplicity=(2nI+1)= 3+1 = 4

3. (c) triplet

4. (a) the molecular io peak had an odd number for its m/z ratio.

this is explained by Nitrogen Rule.

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