Mass spectra and IR multiple choice questions – A-Level Chemistry (Edexcel International)

Mass Spectra and IR

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Compound X consists of carbon, hydrogen and oxygen only. It has only one functional group.

IR spectrum of compound X showing transmittance percentage against wavenumber in cm-1.

What can be deduced about X?

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The infrared spectrum of a compound with molecular formula C₁₀H₁₂O₂ includes strong peaks in the ranges 1,750 - 1,735 cm^-1 and 1,150 - 1,100 cm^-1.

The compound could be

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A sample of element X is analysed using mass spectrometry. The mass spectrum obtained is shown.

Mass spectrum showing relative abundance of isotopes of element X with peaks at m/z 112, 114, and 115.

What is the relative atomic mass of this sample of element X?

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How many structural isomers with the molecular formula C₄H₁₀O give infra-red absorptions both at approximately 1200 cm^-1 and at approximately 3400 cm^-1?

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This question concern the use of infrared (IR) spectra to identify organic compounds.

The IR absorption ranges associated with some organic functional groups are given below.

When propan-2-ol is refluxed with potassium dichromate(VI) and sulfuric acid, the product will show a peak due to

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6 of 16

This question concern the use of infrared (IR) spectra to identify organic compounds.

The IR absorption ranges associated with some organic functional groups are given below.

When propan-1-ol is heated with potassium dichromate(VI) and sulfuric acid, the product, that is distilled off as it is formed, will show a peak due to

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7 of 16

Bromine has two isotopes with relative isotopic masses 79 and 81.

Which of the following values for mass/charge ratio could correspond to a peak in the mass spectrum of bromine, Br₂?

You should assume the ions detected have a single positive charge.

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What is correct about a mass spectrum of a compound?

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The mass spectrum of ethanoic acid has a peak at m/z 45. Which species could cause this?

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Which alcohol is likely to have a fragment ion at m/z = 31 in its mass spectrum?

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Chlorine exists as two isotopes ³⁵Cl and ³⁷Cl in the ratio 3:1.

Which statement about peaks in the mass spectrum of Cl₂ is correct?

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The infrared spectrum of an organic compound is shown.

Infrared spectrum graph of an organic compound showing transmittance versus wavenumber.

Which compound produces this spectrum?

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13 of 16

This question concern the use of infrared (IR) spectra to identify organic compounds.

The IR absorption ranges associated with some organic functional groups are given below.

When propan-2-ol is refluxed with an oxidising agent, the product will show a peak due to

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14 of 16

This question concern the use of infrared (IR) spectra to identify organic compounds.

The IR absorption ranges associated with some organic functional groups are given below.

When propan-1-ol is heated with an oxidising agent, the product, that is distilled off as it is formed, will show a peak due to

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15 of 16

What is always correct about the molecular ion, M⁺, in a mass spectrum of a compound?

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Propanal (CH₃CH₂CHO) and propanone (CH₃COCH₃) are isomers.

Which m/z peak would not be expected in the mass spectrum of propanone?

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