Organic Chemistry Practice Questions
GCSE · GCSE Chemistry · 135 free MCQs with instant results and detailed explanations.
135
Total
38
Easy
66
Medium
31
Hard
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Sample Questions from Organic Chemistry
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Q1
Easy
Which of the following is a characteristic of alkanes?
A.
They are saturated hydrocarbons.
B.
They contain double bonds.
C.
They are highly reactive.
D.
They can form cyclic structures.
Show Answer & Explanation
Correct Answer: A
Alkanes are saturated hydrocarbons, meaning they contain only single bonds between carbon atoms and have the maximum number of hydrogen atoms attached.
Q2
Easy
What is the main product when an alkene reacts with hydrogen in the presence of a catalyst?
A.
Alcohol
B.
Alkane
C.
Polymer
D.
Ether
Show Answer & Explanation
Correct Answer: B
When an alkene reacts with hydrogen (hydrogenation), it converts into an alkane, as hydrogen adds across the double bond, saturating the molecule.
Q3
Easy
What type of reaction is the combustion of hydrocarbons?
A.
Synthesis Reaction
B.
Decomposition Reaction
C.
Redox Reaction
D.
Neutralization Reaction
Show Answer & Explanation
Correct Answer: C
The combustion of hydrocarbons is a redox reaction where hydrocarbons react with oxygen to produce carbon dioxide and water, involving the transfer of electrons.
Q4
Medium
Which of the following statements best describes an alkene?
A.
It contains only single bonds between carbon atoms.
B.
It contains at least one double bond between carbon atoms.
C.
It contains only triple bonds between carbon atoms.
D.
It is a saturated hydrocarbon.
Show Answer & Explanation
Correct Answer: B
Alkenes are hydrocarbons that contain at least one double bond between carbon atoms, which distinguishes them from alkanes that only contain single bonds.
Q5
Medium
Which functional group is characteristic of alcohols?
A.
Carboxyl (-COOH)
B.
Hydroxyl (-OH)
C.
Amino (-NH2)
D.
Ester (-COO-)
Show Answer & Explanation
Correct Answer: B
The hydroxyl group (-OH) is the functional group that defines alcohols, providing them with their characteristic properties.
Q6
Medium
When ethene reacts with bromine, what product is formed?
A.
Bromoethane
B.
Ethane
C.
Bromobutane
D.
Ethyl bromide
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Correct Answer: A
When ethene reacts with bromine, the addition reaction results in the formation of bromoethane, as the double bond opens up to bond with bromine atoms.
Q7
Medium
Which of the following compounds is an example of a ketone?
A.
Propan-1-ol
B.
Butan-2-one
C.
Hexanoic acid
D.
Ethene
Show Answer & Explanation
Correct Answer: B
Butan-2-one is a ketone because it contains a carbonyl group (C=O) located between two carbon atoms, characteristic of ketones.
Q8
Hard
Which of the following statements accurately describes the reactivity of alkenes compared to alkanes?
A.
Alkenes are less reactive than alkanes due to their double bonds.
B.
Alkenes are more reactive than alkanes because they can undergo addition reactions.
C.
Alkenes do not react with halogens, while alkanes do.
D.
Alkenes are more stable than alkanes due to their double bonds.
Show Answer & Explanation
Correct Answer: B
Alkenes have a double bond which makes them more reactive than alkanes, allowing them to participate in addition reactions readily. Alkanes, being saturated, do not have this property.
Q9
Hard
Which of the following reactions represents a typical reaction of a carboxylic acid with an alcohol?
A.
Carboxylic acid + alcohol -> Ester + water
B.
Carboxylic acid + alcohol -> Alkane + carbon dioxide
C.
Carboxylic acid + alcohol -> Ketone + hydrogen gas
D.
Carboxylic acid + alcohol -> Aldehyde + oxygen
Show Answer & Explanation
Correct Answer: A
The reaction of a carboxylic acid with an alcohol typically produces an ester and water, known as esterification. This reaction is fundamental in organic chemistry.
Q10
Hard
Which of the following compounds has the highest boiling point due to hydrogen bonding?
A.
Ethanol (C2H5OH)
B.
Dimethyl ether (C2H6O)
C.
Propane (C3H8)
D.
Cyclohexane (C6H12)
Show Answer & Explanation
Correct Answer: A
Ethanol has a hydroxyl (–OH) group, which allows it to form hydrogen bonds. This strong intermolecular force significantly increases its boiling point compared to the other options that cannot hydrogen bond.
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Organic Chemistry — GCSE GCSE Chemistry Practice Questions Online
This page contains 135 practice MCQs for the chapter Organic Chemistry in GCSE GCSE Chemistry. The questions are organized by difficulty — 38 easy, 66 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.