Chromatography and spectroscopy multiple choice questions

Chromatography and Spectroscopy

Total marks:0 / 20

1 of 20

The retention time in gas chromatography is the time it takes for a compound to pass through the chromatography column.

A column is packed with a stationary phase that is polar.

Which of the following will have the longest retention time in the column?

0 / 1

2 of 20

The type of radiation used in NMR spectroscopy is

0 / 1

3 of 20

In the high resolution proton NMR spectrum of propan-1-ol, CH₃CH₂CH₂OH, there are

0 / 1

4 of 20

The high resolution proton NMR spectrum of ethyl ethanoate, CH₃COOCH₂CH₃ , contains

0 / 1

5 of 20

The diagram below shows a gas chromatogram.

Diagram showing a gas chromatogram with peaks labeled 1 to 5, representing different compounds over time.

Which statement about the gas chromatogram is correct?

0 / 1

6 of 20

What describes a substance with a high retention time in gas-liquid chromatography?

0 / 1

7 of 20

Which statement about gas-liquid chromatography is correct?

0 / 1

8 of 20

A compound produces the ¹³C NMR spectrum below.

Carbon NMR spectrum showing peaks at different chemical shifts.

Which compound could have produced this spectrum?

0 / 1

9 of 20

What is the number of peaks in the ¹H NMR spectrum of HOOCCH₂CHOHCH₂COOH?

0 / 1

10 of 20

Which compound is used as a standard for NMR chemical shift measurements?

0 / 1

11 of 20

How many peaks are there in the ¹³C NMR spectrum of 1,4-dimethylbenzene?

0 / 1

12 of 20

Which amine has only threepeaks in its proton NMR spectrum?

0 / 1

13 of 20

Which statement does notsupport the suggestion that an unknown organic compound is

Diagram showing the structure of an organic compound with the formula CH3COOCH2CH3.

0 / 1

14 of 20

What is the ratio of the areas of the signals in the ¹H NMR spectrum of pentan-3-ol?

0 / 1

15 of 20

What information can be deduced from the splitting pattern of ¹H NMR signals?

0 / 1

16 of 20

What is the ratio of areas under each signal in the ¹H NMR spectrum of 2-methylbutane?

0 / 1

17 of 20

What can be determined about a molecule from the number of signals in its ¹H NMR spectrum?

0 / 1

18 of 20

A chromatogram of two amino acids, A and B, is shown.

The R_f value of amino acid A is...

0 / 1

19 of 20

A chromatogram of two amino acids, A and B, is shown.

The R_f value of amino acid B is...

0 / 1

20 of 20

A compound with the formula C₆H₁₄ gives a ¹³C NMR spectrum with four peaks.

Which compound gives this spectrum?

0 / 1