Mass spectrometry fragmentation patterns

Chemia IBPaper 1A, maj 2026, TZ1wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 18

Which compound could produce this mass spectrum? A. Butanone B. Butanal C. Butan-1-ol D. Butan-2-ol

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Chemia IBPaper 2, maj 2025, TZ2wzorowane4 pktotwarteśrednie (szac.)

Zadanie 3c

The mass spectrum of carbonyl dibromide is shown below. Bromine has two isotopes, $\ce{^{79}Br}$ and $\ce{^{81}Br}$, of almost equal abundance. (i) Explain the origin of the peaks that appear at m/z values smaller than those of the molecular ion. (ii) Deduce…

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Chemia IBPaper 2, listopad 2025, TZ1wzorowane3 pktotwarteśrednie (szac.)

Zadanie 4b

In the mass spectrum of Y, the molecular ion peak appears at m/z 88. (i) Y contains no multiple carbon–carbon bonds and no rings. Deduce its molecular formula. Use section 7 of the data booklet. Shown below is the high-resolution $\ce{^1H}$ NMR spectrum of Y,…

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Chemia IBPaper 1A, specimen 2025wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 19

The mass spectra of four compounds are shown below. Which is the spectrum of propanal, CH₃CH₂CHO? Use section 22 of the data booklet. A. spectrum A B. spectrum B C. spectrum C D. spectrum D

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Chemia IBPaper 1, maj 2024, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 2

What is the molecular formula of the compound with empirical formula CH₂ and the following mass spectrum? A. C₄H₈ B. C₆H₁₂ C. C₇H₁₄ D. C₈H₁₆

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Chemia IBPaper 2, maj 2024, TZ2wzorowane3 pktotwarteśrednie (szac.)

Zadanie 5d

Propenal can be oxidised to compound G. G produces bubbles of gas when it is added to aqueous sodium hydrogencarbonate. The mass spectrum of G is shown. Deduce what G is and give two reasons, based on the mass spectrum.

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Chemia IBPaper 3, maj 2024, TZ1wzorowane1 pktotwartełatwe (szac.)

Zadanie 18b

A student converts methyl 4-hydroxybenzoate (M_r = 152.15) into methyl 4-methoxybenzoate (M_r = 166.18) by replacing the hydrogen atom of the phenol group with a methyl group. The product was analysed in a mass spectrometer. Suggest how…

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Chemia IBPaper 2, listopad 2024wzorowane3 pktotwarteśrednie (szac.)

Zadanie 5e

The mass spectrum of 3-methylbutanoic acid is shown. (i) Suggest why the spectrum shows a small peak at m/z 103. (ii) Identify the fragments responsible for the peaks at m/z 87 and m/z 57. Use section 22 of the data booklet.

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Chemia IBPaper 1, listopad 2024wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 38

Which statements about the molecular ion, M⁺, in a mass spectrum are correct? I. The M⁺ peak is always the peak of greatest intensity in the spectrum. II. The M⁺ ion forms when a molecule loses one electron. III. The m/z…

Chemia IBPaper 2, maj 2023, TZ2wzorowane8 pktotwarteśrednie (szac.)

Zadanie 1a

An unknown organic compound, X, contains only carbon, hydrogen and oxygen. Elemental analysis shows that it contains 54.5 % carbon and 36.3 % oxygen by mass. (i) Determine the empirical formula of X. The mass spectrum of X is shown. (ii) Identify the species…

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Chemia IBPaper 3, maj 2023, TZ1wzorowane2 pktotwarteśrednie (szac.)

Zadanie 21b

A forensic laboratory identifies a solvent by mass spectrometry. The mass spectrum of a sample of pentan-3-one, CH₃CH₂COCH₂CH₃, M_r 86, is shown. Explain how the peaks at m/z 86 and m/z 57 support the identification of the compound as…

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Chemia IBPaper 3, maj 2023, TZ2wzorowane3 pktotwarteśrednie (szac.)

Zadanie 27a

Propan-1-ol can be identified by a variety of analytical techniques. Predict the structures of three possible fragments you would expect from the mass spectrum of propan-1-ol. Use section 22 of the data booklet.

Chemia IBPaper 3, listopad 2023, TZ1wzorowane1 pktotwarteśrednie (szac.)

Zadanie 19b

The mass spectrum of ibuprofen (M_r = 206) has a peak at m/z = 161. Suggest which fragment, lost from the molecular ion, could account for this peak. Use section 22 of the data booklet.

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Chemia IBPaper 3, listopad 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 19b

Salbutamol, used to treat asthma, has a relative molecular mass M_r = 239. Its mass spectrum has a peak at m/z = 221. Suggest a neutral fragment whose loss could account for this peak. Use section 22 of the data booklet.

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Chemia IBPaper 2, maj 2022, TZ2wzorowane3 pktotwartełatwe (szac.)

Zadanie 8b

(i) State two features that show that ethene and propene are members of the same homologous series. (ii) The mass spectrum of pentane is shown. Suggest the species responsible for peak R. Use section 22 of the data booklet.

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Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 40

Which compound produces this mass spectrum? A. Propanoic acid, CH₃CH₂COOH B. Ethyl methanoate, HCOOCH₂CH₃ C. Butan-1-ol, CH₃CH₂CH₂CH₂OH D. Methyl ethanoate, CH₃COOCH₃

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Chemia IBPaper 1, listopad 2022wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 38

What information about pentan-2-one, CH₃COCH₂CH₂CH₃, can be obtained from mass spectrometry (MS), infrared (IR) spectroscopy and ¹H NMR spectroscopy? A. MS: the compound contains a carbonyl group; IR: the molar mass is 86 g mol⁻¹;…