Revision self assessment

Question 1:

Question 2:

Question 3:

Question 4:

Question 5:

Try and match up the functional groups (red, blue and black) with the corresponding group of peaks on the NMR spectra (A, B or C)

CH₃ (Red)

CH₂ (Blue)

CH₂(Black)

If you have 3 out of 3 well done you are CORRECT. If not please read the notes below and try again

The functional group CH₂ (black) is surrounded by 4 hydrogens, therefore following the n + 1 rule corresponds to a quintet

The functional group CH₂ (blue) has 5 neighbouring hydrogens there it corresponding signal has 6 peaks

There are two terminal CH₃ (red) which gives rise to the higher peak heights. They are surrounded by only 2 neighbouring hydrogens therefore there signal is a triplet

There are two terminal CH3 (red) which gives rise to the higher peak heights.  They are surrounded by only 2 neighbouring hydrogens therefore there signal is a triplet

The functional group CH2 (blue) has 5 neighbouring hydrogens there it corresponding signal has 6 peaks

The functional group CH2 (black) is surrounded by 4 hydrogens, therefore following the n + 1 rule corresponds to a quintet

Please read the notes below and try again

The functional group CH₂ (black) is surrounded by 4 hydrogens, therefore following the n + 1 rule corresponds to a quintet

The functional group CH₂ (blue) has 5 neighbouring hydrogens there it corresponding signal has 6 peaks

There are two terminal CH₃ (red) which gives rise to the higher peak heights. They are surrounded by only 2 neighbouring hydrogens therefore there signal is a triplet

Question 6:

Match the functional groups (red and blue) with there corresponding clusters of peaks (A or B) on the NMR spectra

CH₂ (Blue)

CH₃(Red)

If you have 2 out of 2 - Well done you are CORRECT

The CH₂ (blue) functional group has a higher chemical shift value than normal because of the deshielding effect of the nitrogen. It has 3 neighbouring hydrogens and is represented by a quadruplet

The CH₃ (red) functional group has a lower chemical shift and is represented by a triplet on the spectra which represents the 2 neighbouring hydrogens

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You have got one answer wrong - look at the notes below and try again

The CH₂ (blue) functional group has a higher chemical shift value than normal because of the deshielding effect of the nitrogen. It has 3 neighbouring hydrogens and is represented by a quadruplet

The CH₃ (red) functional group has a lower chemical shift and is represented by a triplet on the spectra which represents the 2 neighbouring hydrogens

Question 7:

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1.5 Revision self assessment