17. Carbonyl compounds
A section of Chemistry, 9701
Listing 10 of 304 questions
2-methylbut-1-ene reacts with acidifiedmanganate(ions, under specific conditions, to produce two organic compounds X and Y. X immediately reacts with the acidifiedmanganate(ions to form carbondioxide and water. Y has the structural formula CH3CH2COCH3. 2-methylbut-1-ene X Y CH3CH2COCH3 CO2 + H2O acidified manganate(ions + Draw the skeletal formula of 2-methylbut-1-ene.  State the specific conditions required for the acidified manganate(ions to react with 2-methylbut-1-ene in this way. Name the type of reaction occurring to the functional group in 2‑methylbut‑1‑ene in the reaction in . Draw the structural formula of X. Describe a chemical test and the expected observationto confirm the presence of the carbonyl functional group in Y. The infra-red spectrum of 2-methylbut-1-ene is shown. 0.8 0.6 0.4 0.2 relative transmittance wavenumber / cm–1 Predict two main differences that would be seen between the spectra of Y, CH3CH2COCH3, and of 2-methylbut-1-ene. Give reasons for your predictions. Your answer should refer only to the region of each spectrum above 1500 cm–1. Propanoic acid, CH3CH2CO2H, is reduced by LiAl H4. Write an equation to show this reaction. Use to represent an atom of hydrogen from the reducing agent. Name the organic product formed in this reaction. Organic compound W is an ester which is a structural isomer of propanoicacid. State the molecular formula of W. Draw a possible structure of W.  
9701_s20_qp_21
THEORY
2020
Paper 2, Variant 1
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When an organic compound is oxidised, any oxygen atom gained by the organic molecule is considered to be from a water molecule also producing 2H+ + 2e–. Any hydrogen atom lost may be considered to be lost as H+ + e–. These changes can be represented by the following two equations. H2O  [O] + 2H+ + 2e– [H]  H+ + e– Compound X is oxidised by heating under reflux with hot, acidified potassium dichromate(for one hour. The half-equation for the reduction reaction is shown...
9701_s21_qp_11
MCQ
2021
Paper 1, Variant 1
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