This question is about carboxylic acids and their derivatives.
Lactic acid, CH3CH(OH)COOH, is produced in muscles as a result of anaerobic respiration.
Give a reason why lactic acid shows optical isomerism.
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A reaction scheme involving butanoic acid is shown.
Identify X, Y and Z by name or formula.
Alcohol X |
Reagent Y |
Compound Z |
The repeat unit of a polyester is shown.
Give the structures of the two monomers that could form this polyester.
Monomer 1 |
Monomer 2 |
An organic compound E contains carbon, hydrogen and oxygen only.
The accurate relative atomic masses, Ar , of the three elements in E are shown in the table.
Element | Ar |
hydrogen | 1.0078 |
carbon | 12.0000 |
oxygen | 15.9949 |
E contains five carbon atoms and gives a molecular ion peak at m / z = 102.0678 in its mass spectrum.
Deduce the molecular formula of E.
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Name the functional group in E.
Peak |
Chemical shift, / ppm for TMS |
Splitting pattern | Relative peak area |
A | 4.02 | triplet | 2 |
B | 2.05 | singlet | 3 |
C | 1.65 | sextet | 2 |
D | 0.95 | triplet | 3 |
Deduce the structure of E.
Justify your answer by labelling the protons responsible for each peak.
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