Download The conversion of linoleic acid, C18H3202, into steracic acid

Higher Unit 2
PRACTICE QUESTIONS
1
Multiple Choice
1.
2.
3.
4.
6.
The conversion of linoleic acid, C18H32O2, into
stearic acid, C18H36O2, is likely to be achieved
by
A
Cyclohexane
A
hydrogenation
B
Methylpentane
B
hydrolysis
C
Hexane
C
hydration
D
Cyclohexene
D
dehydrogenation.
7.
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
8.
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
5.
Which of the following hydrocarbons
immediately decolourises bromine water?
A
44
B
72
C
84
D
100
Which of the following is true of alkanones?
A
B
They are formed by oxidation of primary
alkanols.
They can be easily oxidised to acids
C
They may contain the structure
D
They will reduce Fehling’s (Benedict’s)
solution.
2
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?
9.
Which of the following is an aldehyde?
12. The structural formula for glycerol is
10.
13. Which is true of a compound with the following
formula?
The above molecule can be classified as
A an amino acid
CH3CH(OH)CH3
B
an ester
A
It is a primary alcohol.
C
a peptide
B
It can be a tertiary alcohol.
D
a protein.
C
It is a tertiary alcohol.
D It can be oxidised to a ketone.
14. Rum flavouring is based on the compound with
the formula shown:
11. Propanoic acid is reacted with ethanol.
The formula for one of the products is
It can be made from
3
A
ethanol and butanoic acid
B
propanol and ethanoic acid
C
butanol and methanoic acid
D
propanol and propanoic acid.
15. Essential amino acids are defined as the
amino acids which
A
are necessary for building polypeptides
B
humans must acquire through their diet
C
D
plants cannot synthesise for themselves
are produced when any protein is
hydrolysed.
16. In which of the following kinds of compounds is
nitrogen always present?
A
Enzymes
B
Oils
C
Polyesters
D
Carbohydrates
4
17. Which process is represented by the following equation
A
Condensation
B
Hydrolysis
C
Oxidation
D
Dehydration
5
18. Which of the following is an ester?
19. Fats and oils can be classified as
A
Soaps
B
Fatty acids
C
Esters
D
Polyesters.
6
20. 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?
21. Methanol may be converted to methanal by
A
oxidation
B
hydration
C
cracking
D
condensation.
7
Written Questions
Marks
(a) i)
ii)
Which type of chemical reaction occurs when butan-1-ol reacts with ethanoic acid in the
presence of concentrated sulphuric acid?
1
Draw the full structural formula for the organic product in (c ) (i).
1
8
Marks
2.
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
3.
a).
Give the systematic names of the two compounds which, when warmed with concentrated
sulphuric acid, react to form the above compound.
9
2
4.
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.
1
(b) Which two compounds are isomeric?
1
(c) State the type of reaction which converts compound D to I
1
(d) What would be observed during the conversion of
i)
Compound D to I;
2
ii)
Compound I to J?
2
10
5.
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.
1
(b) To which set of compounds do enzymes belong?
1
(c) The hydrolysis of tristearin produces a fatty acid.
Name the other product of this reaction.
1
(3)
11