Worksheets3.3.9.1 Carboxylic acids and esters (A-level only)
Total questions: 13
Worksheet time: 7mins
Which one of the following is not a correct statement about vitamin C, shown?
It is a cyclic ester.
It can form a carboxylic acid on oxidation.
It decolourises a solution of bromine in water.
It is a planar molecule.
Propanoic acid reacts with methanol in the presence of a small amount of concentrated sulphuric acid. The empirical formula of the ester formed is
CH2O
C2H6O2
C2H4O2
C2H4O
Which one of the following is not a correct general formula for the non-cyclic compounds listed?
alcohols CnH2n+2O
aldehydes CnH2n+1O
esters CnH2nO2
primary amines CnH2n+3N
For this question refer to the reaction scheme.
Which one of the following statements is not correct?
Reaction of W with sodium cyanide followed by hydrolysis of the resulting product gives propanoic acid.
Mild oxidation of Z produces a compound that reacts with Tollens’ reagent, forming a silver mirror.
Z reacts with ethanoic acid to produce the ester propyl ethanoate.
W undergoes addition polymerisation to form poly(propene).
Ibuprofen is a drug used as an alternative to aspirin for the relief of pain, fever and inflammation. The structure of ibuprofen is shown.
Which one of the following statements is not correct?
It has optical isomers.
It liberates carbon dioxide with sodium carbonate solution.
It undergoes esterification with ethanol.
It undergoes oxidation with acidified potassium dichromate(VI).
Butan-1-ol was converted into butyl propanoate by reaction with an excess of propanoic acid. In the reaction, 6.0 g of the alcohol gave 7.4 g of the ester. The percentage yield of ester was
57
70
75
81
Which compound is formed by the reaction of ethane-1,2-diol with an acid?
CH3CH2 — O — CH2CH2OH
An excess of methanol was mixed with 12 g of ethanoic acid and an acid catalyst. At equilibrium the mixture contained 8 g of methyl ethanoate. The percentage yield of ester present was
11
20
54
67
Acid hydrolysis of the compound shown produces
CH3CH(OH)CH2CH2COOH
CH2(OH)CH2CH2CH2COOH
CH3CH(OH)CH2CH2OCHO
CH2(OH)CH2CH2CH2OCHO
The structural formula of ethyl 2-methylpropanoate is
Hydrolysis of the ester, CH3COOCH2CH2CH3, produces ethanoic acid. In an experiment, 2.04 g of the ester was used and 0.90 g of ethanoic acid was produced. The percentage yield of ethanoic acid was:
44
59
75
90
How many structural isomers, which are esters, have the molecular formula C4H8O2?
2
3
4
5
Isomers of the ester HCOOCH2CH2CH3, include
(i) ethyl ethanoate
(ii) methyl propanoate
(iii) butanoic acid
(iv) butyl methanoate
(i), (ii) and (iii) only
(i) and (iii) only
(ii) and (iv) only
(iv) alone
