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Essential Chemistry for IGCSE - The Variety Of Organic Chemicals (Section 2)

1
What type of reaction does ethanol undergo when heated with acidified potassium dichromate?
Answer
(A)
Oxidation
2
Which of the following is the general formula for carboxylic acids?
Answer
(C)
R-COOH
3
Which of the following is characteristic of a homologous series of organic compounds?
Answer
(D)
All of the above.
4
Which of the following is the best description of a homologous series?
Answer
(D)
A group of compounds that undergo the same type of reaction.
5
What process is used to convert long-chain alkanes into more useful shorter-chain alkanes and alkenes?
Answer
(B)
Cracking
6
What is the main function of ethanol in alcoholic beverages?
Answer
C
D
7
Which of the following is the correct formula of ethanol?
Answer
(C)
C2H5OH
8
Which of the following are products of the reaction between ethanoic acid and sodium hydroxide?
Answer
(B)
Sodium ethanoate and water
9
What is the name of the product formed when ethanol reacts with ethanoic acid?
Answer
(B)
Ethyl ethanoate
10
What are the products of complete combustion of methane (CH4)?
Answer
A
B
11
Which of the following is produced when an alcohol is oxidized?
Answer
(C)
A carboxylic acid
12
What is the main use of ethanol in perfumes?
Answer
(B)
To act as a solvent.
13
What is the main product of the reaction between ethanoic acid and sodium carbonate?
Answer
(A)
Sodium ethanoate
14
Which of the following is the general formula for a carboxylic acid?
Answer
(C)
CnH2nO2
15
Which is a characteristic of the reaction of ethanol with potassium dichromate?
Answer
(B)
Oxidation of the alcohol
16
Which of the following are produced by the reaction of a carboxylic acid with an alcohol?
Answer
(B)
An ester and water
17
What type of reaction is the reaction of an alkene with bromine water?
Answer
(A)
Addition
18
In the complete combustion of alkanes, what are the products?
Answer
(B)
Carbon dioxide and water
19
Which of the following is produced when ethene reacts with steam in the presence of a catalyst?
Answer
(B)
Ethanol
20
What functional group characterizes carboxylic acids?
Answer
(C)
-COOH
21
Which of the following factors affect the boiling point of an alkane?
Answer
A
B
C
22
Which of the following can be added to a gas to detect the presence of alkenes?
Answer
(B)
Bromine water
23
Which of the following will react with ethanoic acid (acetic acid)?
Answer
A
B
C
24
What is a common catalyst used in the cracking of hydrocarbons?
Answer
(C)
Aluminium oxide
25
What is the key difference between alkenes and alkanes?
Answer
B
C
26
Which of the following substances can act as catalysts in cracking?
Answer
A
B
27
Which of the following is the most appropriate catalyst for producing ethanol from ethene and steam?
Answer
(C)
Phosphoric acid
28
Which of the following is the functional group present in an alcohol?
Answer
(B)
-OH
29
Which of the following correctly describes the reaction of carboxylic acids?
Answer
(A)
They react with bases to form a salt and water.
30
Which of the following compounds is an example of an alkene?
Answer
(C)
Ethene
31
What type of reaction takes place when ethanol is oxidized by an oxidizing agent such as acidified potassium dichromate?
Answer
(C)
Oxidation
32
Which of the following statements about alkanes is/are correct?
Answer
A
C
D
33
Which of the following is the main function of the -COOH group?
Answer
(B)
To act as an acid.
34
What type of reaction occurs when an alkene reacts with bromine water?
Answer
(B)
Addition
35
What is the general trend of the boiling points of alkanes as the chain length increases?
Answer
(B)
Increases
36
In the context of alkanes, what does the term 'saturated' refer to?
Answer
(B)
The presence of only single bonds.
37
What is the main difference between saturated and unsaturated hydrocarbons?
Answer
(A)
Saturated hydrocarbons have single bonds; unsaturated hydrocarbons have double or triple bonds.
38
Which of the following statements about cracking is correct?
Answer
A
B
C
D
39
What is the name of the reaction between a carboxylic acid and an alcohol?
Answer
(A)
Esterification
40
What type of bond is present in alkanes?
Answer
(D)
Single covalent
41
Which of the following statements best describes the role of a catalyst in cracking?
Answer
(C)
It changes the activation energy of the reaction.
42
What is a typical reagent in the oxidation of ethanol to ethanoic acid?
Answer
(A)
Acidified potassium dichromate
43
What is the product of the oxidation of ethanol?
Answer
(C)
Ethanoic acid
44
What is the reaction of ethanoic acid and sodium carbonate?
Answer
(A)
Neutralization
45
What type of reaction does an alkene undergo with bromine water?
Answer
(A)
Addition
46
Which of the following would be the best method for producing a large amount of ethanol from ethene?
Answer
(A)
Adding steam to ethene and using a catalyst.
47
Which of the following is formed when ethanol is oxidized using acidified potassium dichromate?
Answer
(C)
Ethanoic acid
48
Which term is used to describe the process of joining small molecules to form a large molecule?
Answer
(B)
Polymerization
49
Which of the following is a property of ethanoic acid?
Answer
(C)
It reacts with sodium carbonate to produce carbon dioxide.
50
What is the name of the process by which ethanol is often produced on an industrial scale?
Answer
(C)
Hydration