Zadanie 17
What are the splitting patterns of the signals in the 1H NMR spectrum of ethoxyethane, CH3CH2OCH2CH3? A. A doublet and a quartet B. A triplet and a quartet C. A singlet and a triplet D. A doublet and a triplet
Proton NMR splitting patterns
Use the n+1 rule to interpret singlets, doublets, triplets and quartets in a 1H NMR spectrum, deduce how many hydrogens sit on neighbouring carbons, and combine this with shifts and integration to pin down a structure.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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Zadanie 3c
(i) Concentrated sulfuric acid, H2SO4, is used as the catalyst in the manufacture of propyl ethanoate. Explain how the catalyst affects the reaction. (ii) The conversion of propane into 1-bromopropane,…
Zadanie 4c
Iodoethane can react with aqueous hydroxide ions to produce ethanol. CH3CH2I(l) + OH−(aq) → CH3CH2OH(aq) + I−(aq) (i) State what type of reaction this is. (ii) Using curly arrows to show the movement of electron pairs, sketch the mechanism of this…
- Materiał graficzny
Zadanie 18
The NMR spectra of four compounds are described below. Which is the spectrum of propanone, CH3COCH3? Use section 21 of the data booklet. A. one singlet at 2.2 ppm B. a quartet at 2.4 ppm and a triplet at 1.0 ppm, with relative areas 2 : 3…
- Materiał graficzny
Zadanie 20b
A sample is known to be either propan-1-ol or propanoic acid. Its 1H NMR spectrum is shown. (i) Deduce, giving a reason, whether the sample is propan-1-ol or propanoic acid. Use section 21 of the data booklet. (ii) Predict, giving a reason, the splitting…
- Materiał graficzny
Zadanie 40
A signal in the 1H NMR spectrum of an organic compound is a triplet. What does the splitting of this signal show? A. There are three hydrogen atoms in the chemical environment that gives the signal. B. There are three different chemical environments for…
Zadanie 40
What are the number of signals and the splitting of these signals in the 1H NMR spectrum of ethoxyethane, CH3CH2OCH2CH3? A. 1 signal, a singlet B. 2 signals, a triplet and a quartet C. 2 signals, two triplets D. 2 signals, a doublet and a quartet
Zadanie 5d
(i) Predict the number of signals in the 1H NMR spectrum of 3-methylbutanoic acid and the ratio of their areas. (ii) Predict the splitting pattern of the signal due to the two hydrogen atoms of the CH2 group. (iii) State one reason why…
- Materiał graficzny
Zadanie 39
Which compound gives this 1H NMR spectrum? A. Diethyl ether, CH3CH2OCH2CH3 B. Methyl propanoate, CH3CH2COOCH3 C. Butanone, CH3COCH2CH3 D. Ethyl ethanoate, CH3COOCH2CH3
- Materiał graficzny
Zadanie 6c
Propanoic acid reacts with methanol to produce an ester. (i) Draw the full structural formula of the organic product. (ii) Predict the number of signals, and their splitting patterns, in the 1H NMR spectrum of this ester. (iii) The chemical shifts in…
Zadanie 40
Which compound produces the high resolution 1H NMR spectrum shown? A. Propanone B. Butanal C. Butanone D. Pentan-3-one
- Materiał graficzny
Zadanie 40
Use section 21 of the data booklet. The high resolution 1H NMR spectrum of an unknown compound is shown. Which compound is it? A. Butane B. Butanone C. Ethoxyethane D. Pentan-3-one
- Materiał graficzny
Zadanie 8e
(i) Explain the mechanism of the reaction between 1-chloropropane, CH3CH2CH2Cl, and aqueous potassium hydroxide, KOH(aq), using curly arrows to represent the movement of electron pairs. (ii) Deduce the splitting pattern, in the NMR…
Zadanie 6g
(i) Deduce the number of signals and the ratio of the areas under the signals in the NMR spectrum of 2-bromopentane. Number of signals: Ratio of areas: (ii) Identify the splitting pattern of the signal of (A) the hydrogen atoms of the methyl group…