Analytical Techniques - exam practice

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?

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

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

The diagram below shows a gas chromatogram.

Which statement about the gas chromatogram is correct?

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

Which statement about gas-liquid chromatography is correct?

A compound produces the ¹³C NMR spectrum below.

Which compound could have produced this spectrum?

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

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

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

Which amine has only threepeaks in its proton NMR spectrum?

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

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

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

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

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

The R_f value of amino acid A is...

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

The R_f value of amino acid B is...

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

Which compound gives this spectrum?