MYTUTOR SUBJECT ANSWERS

321 views

How do I find the molecule from the 1H NMR spectrum?

(Note: proton and 1H+ are the same thing)

1. Draw a table with the following headings:

δ / ppm, integral, splitting, observations

2. Count how many peaks there are in the spectrum. (Doublets, triplets etc. count as one peak). This is how many proton environments there are.

3. Record the chemical shifts for each peak under δ / ppm. Using the data sheet (provided by your exam board), write down the possible functional group(s) for that shift under observations. (Usually you will have other forms of analysis to help assign the functional groups.)

4. Record the value of the integral/ measure their relative heights. This is the ratio of protons in each environment. Under observations, note that this is the probable number of hydrogens in that environment.

5. Record the splitting pattern. From this you know how many hydrogens are on adjacent carbon atoms - record this under observations. Remember the n + 1 rule. i.e. doublet = 1, triplet = 2 etc. and a doublet of triplets is -CHR2 and -CH2R.

6. Now it is simply a jigsaw puzzle. You have all the components and need to arrange them to fit with your above observations. Don't forget to look for lines of symmetry if there are a high number of hydrogens in the same environment. The more practice you get, the quicker you will be able to answer these questions.

Daisy D. A Level Chemistry tutor, GCSE Chemistry tutor, A Level Maths...

8 months ago

Answered by Daisy, an A Level Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

98 SUBJECT SPECIALISTS

£26 /hr

Martyna S.

Degree: Neurotechnology (Masters) - Imperial College London University

Subjects offered:Chemistry, Science+ 4 more

Chemistry
Science
Maths
Biology
.BMAT (BioMedical Admissions)
-Personal Statements-

“PhD candidate in Bioengineering at Imperial College London. Long experience in effective tutoring!”

£22 /hr

Xanthe W.

Degree: Biological Sciences with a Year in Industry/Research (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 1 more

Chemistry
Maths
Biology

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

£22 /hr

Kashf S.

Degree: Chemistry (Bachelors) - University College London University

Subjects offered:Chemistry, Maths

Chemistry
Maths

“Hi, I'm a first year Chemistry student at UCL, I have experience in tutoring and am willing to tutor people of all abilities”

About the author

£20 /hr

Daisy D.

Degree: Natural Sciences: Chemistry and Mathematics, MSci (Other) - Durham University

Subjects offered:Chemistry, Physics+ 2 more

Chemistry
Physics
Maths
Further Mathematics

“Hi, I'm Daisy! I'm currently in my 3rd year studying an integrated masters course in Natural Sciences (Chemistry and Maths) at Durham University. My main area of interest is the physcial side of both subjects. From a young age, I hav...”

MyTutor guarantee

You may also like...

Posts by Daisy

A stationary radium atom decays, emiting an alpha particle. Why is the recoil speed of the nucleus small compared to the alpha particle?

How do buffers work?

How do I find the molecule from the 1H NMR spectrum?

How is crude oil separated into fractions?

Other A Level Chemistry questions

What is Mass Spectrometry?

Why do group 3 metals form more acidic aqueous solutions than group 2 metals?

Why does the bromine become polarised in HBr during electrophilic addition

What is a mole?

View A Level Chemistry tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok