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Spin-spin coupling

Total questions: 18

Worksheet time: 34mins

Name
Class
Date
1.

Protons with the same chemical environment are chemically equivalent and they appear at the same chemical shift in a 1HNMR experiment

a)

True

b)

False

2.

Dimethylmalonate has three groups of chemically equivalent protons

a)

True

b)

False

3.

In a 13CNMR experiment, when a 13C couples with one atom of deuterium affords a...

a)

Triplet

b)

Doublet

c)

Singlet

d)

Doublet of doublets

4.

In a 1HNMR experiment, when a 1H couples with one atom of 19F affords a...

a)

Triplet

b)

Doublet

c)

Singlet

d)

Doublet of doublets

5.

In a 1HNMR experiment, when a 13C couples with one atom of 31P affords a...

a)

Triplet

b)

Doublet

c)

Singlet

d)

Non of the answers

6.

The following 1HNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

1,2,2-Trichloroethane

b)

1,1,1-Trichloroethane

c)

1,2-Dichloroethane

d)

1,1-Dichloroethane

7.

The following 1HNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

DMF

b)

N-Methylacetamide

c)

Propanamide

d)

Aminoacetone

8.

The following 1HNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

p-Ethylaniline

b)

o-Ethylaniline

c)

m-Ethylaniline

d)

N,4-dimethylaniline

9.

The following 1HNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

2-Methylbut-3-en-2-ol

b)

3-Methylbut-3-en-2-ol

c)

(E)-2-Methylbut-2-en-1-ol

d)

(Z)-2-Methylbut-2-en-1-ol

10.

Which of the following molecules shows a 1H-1H coupling constant (J) of 17 Hz in its 1HNMR spectrum (CDCl3, 300 MHz)?

a)

(E)-pent-2-ene

b)

(Z)-pent-2-ene

c)

(E)-hex-3-ene

d)

(Z)-hex-3-ene

11.

Which of the following molecules shows a ddd with coupling constants (J = 17, 13 and 7 Hz) in its 1HNMR spectrum (CDCl3, 300 MHz)?

a)

3-Methylbut-1-ene

b)

Pent-1-ene

c)

(E)-Pent-2-ene

d)

(Z)-Pent-2-ene

12.

The scalar or indirect coupling is responsible for the line splitting in a 1HNMR spectrum

a)

False

b)

True

13.

The value of a coupling constant depends on the external magnetic field applied to the sample

a)

False

b)

True

14.

3-Methylhexane has...

a)

3 Spin systems

b)

2 Spin systems

c)

1 Spin system

d)

None spin systems

15.

Protons in chlorofluoromethane are...

a)

Enantiotopic protons

b)

Diastereotopic protons

c)

Homotopic protons

16.

Protons in dichloromethane are...

a)

Enantiotopic protons

b)

Diastereotopic protons

c)

Homotopic protons

17.

The two protons in the C-2 in methyl 3-methylbutanoate are...

a)

Enantiotopic protons

b)

Diastereotopic protons

c)

Homotopic protons

18.

The two protons in the C-2 in methyl 3-methylpentanoate are...

a)

Enantiotopic protons

b)

Diastereotopic protons

c)

Homotopic protons