The Conversion of Linoleic Acid, C18H3202, Into Steracic Acid, C18H3602, Is Likely to Be

Higher Unit 2

PRACTICE QUESTIONS

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Multiple Choice
The conversion of linoleic acid, C18H32O2, into stearic acid, C18H36O2, is likely to be achieved by
A / hydrogenation
B / hydrolysis
C / hydration
D / dehydrogenation.
Which of the following could be used to oxidise an alcohol to the corresponding organic acid?
A / Phosphorus pentachloride
B / Aluminium oxide
C / Copper(II) oxide
D / Sodium
Which of the following compounds has isomeric forms?
A / C2H3Cl
B / C2H5Cl
C / C2HCl3
D / C2H4Cl2
Which hydrocarbon is not a member of the same homologous series as the others?
Relative formula mass
A / 44
B / 72
C / 84
D / 100
Which of the following is true of alkanones?
A / They are formed by oxidation of primary alkanols.
B / They can be easily oxidised to acids
C / They may contain the structure

D / They will reduce Fehling’s (Benedict’s) solution.
Which of the following hydrocarbons immediately decolourises bromine water?
A / Cyclohexane
B / Methylpentane
C / Hexane
D / Cyclohexene
Which compound has a formula mass of 84 amu?
A / Hexane
B / Hexene
C / Cyclohexene
D / Methylpentane
Which of the following compounds is hydrolysed when warmed with sodium hydroxide solution?

Which of the following is an aldehyde?

The above molecule can be classified as
A / an amino acid
B / an ester
C / a peptide
D / a protein.
Propanoic acid is reacted with ethanol.
The formula for one of the products is
The structural formula for glycerol is

Which is true of a compound with the following formula?
CH3CH(OH)CH3
A / It is a primary alcohol.
B / It can be a tertiary alcohol.
C / It is a tertiary alcohol.
D / It can be oxidised to a ketone.
Rum flavouring is based on the compound with the formula shown:

It can be made from
A / ethanol and butanoic acid
B / propanol and ethanoic acid
C / butanol and methanoic acid
D / propanol and propanoic acid.
Essential amino acids are defined as the amino acids which
A / are necessary for building polypeptides
B / humans must acquire through their diet
C / plants cannot synthesise for themselves
D / are produced when any protein is hydrolysed.
In which of the following kinds of compounds is nitrogen always present?
A / Enzymes
B / Oils
C / Polyesters
D / Carbohydrates

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Which process is represented by the following equation

A / Condensation
B / Hydrolysis
C / Oxidation
D / Dehydration

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Which of the following is an ester?

Fats and oils can be classified as
A / Soaps
B / Fatty acids
C / Esters
D / Polyesters.
On complete hydrolysis, a peptide produced 5 amino acids represented by the letters P, Q, R, S and T. The following fragments were produced on partial hydrolysis:

Which of the sequences below could be the correct one for the arrangement of amino acids in the peptide?

Methanol may be converted to methanal by
A / oxidation
B / hydration
C / cracking
D / condensation.

Written Questions

Marks

(a) / i) / Which type of chemical reaction occurs when butan-1-ol reacts with ethanoic acid in the presence of concentrated sulphuric acid? / 1
ii) / Draw the full structural formula for the organic product in (c ) (i). / 1
Marks
The reaction scheme shows a number of common reactions
(a) / Name compounds P, Q, R and S. / 2
(b) / State the types of chemical reaction occurring at (1) and (2). / 2
(c) / Write a structural formula for compound Y. / 1
(d) / Describe a chemical test you could use to distinguish between compound Q and propanone. / 2
(e) / Name the class compounds to which Z belongs / 1
a). /
Give the systematic names of the two compounds which, when warmed with concentrated sulphuric acid, react to form the above compound. / 2
In the flow diagram, compound A is converted into a mixture of B and D, which are in turn converted into other products as shown.
(a) / Name compound G. /

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(b) / Which two compounds are isomeric? /

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(c) / State the type of reaction which converts compound D to I /

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(d) / What would be observed during the conversion of
i) / Compound D to I; / 2
ii) / Compound I to J? / 2
Mutton fat contains a compound called tristearin.
Trisearin is hydrolysed in the body during digestion by an enzyme known as lipase.
(a) / Give one reason why fats can be a useful part of a balanced diet. /

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(b) / To which set of compounds do enzymes belong? /

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(c) / The hydrolysis of tristearin produces a fatty acid.
Name the other product of this reaction. /

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(3)

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