Organic Chemistry Practice Questions
Thanaweya Amma (Egypt) · Thanaweya Chemistry · 137 free MCQs with instant results and detailed explanations.
137
Total
37
Easy
69
Medium
31
Hard
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Sample Questions from Organic Chemistry
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Q1
Easy
What type of reaction occurs when ethene is converted to ethane?
A.
Hydrogenation
B.
Dehydration
C.
Halogenation
D.
Oxidation
Show Answer & Explanation
Correct Answer: A
The conversion of ethene to ethane involves the addition of hydrogen across the double bond, which is known as a hydrogenation reaction.
Q2
Easy
Which functional group is present in alcohols?
A.
Hydroxyl group (-OH)
B.
Carbonyl group (C=O)
C.
Amino group (-NH2)
D.
Carboxyl group (-COOH)
Show Answer & Explanation
Correct Answer: A
Alcohols contain a hydroxyl group (-OH) attached to a carbon atom, which is the defining characteristic of this functional group.
Q3
Easy
Which of the following is a saturated hydrocarbon?
A.
Ethene
B.
Cyclopropane
C.
Propyne
D.
Benzene
Show Answer & Explanation
Correct Answer: B
Cyclopropane is a saturated hydrocarbon as it contains only single bonds between carbon atoms. The others have double or triple bonds.
Q4
Medium
Which of the following compounds is a ketone?
A.
C3H6O
B.
C2H5OH
C.
CH3COOH
D.
C6H12O6
Show Answer & Explanation
Correct Answer: A
C3H6O is a ketone because it has a carbonyl group (C=O) between two carbon atoms. The other options represent an alcohol, a carboxylic acid, and a sugar, respectively.
Q5
Medium
What type of isomerism is observed in butene (C4H8)?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
Tautomeric isomerism
Show Answer & Explanation
Correct Answer: B
Butene exhibits geometric isomerism due to the presence of a double bond, allowing for cis and trans configurations. This type of isomerism arises from restricted rotation around the double bond.
Q6
Medium
Which of the following reactions represents an elimination reaction?
A.
C2H5Br + NaOH → C2H4 + NaBr + H2O
B.
C2H5OH + HCl → C2H5Cl + H2O
C.
C3H6 + H2 → C3H8
D.
C4H10 + O2 → CO2 + H2O
Show Answer & Explanation
Correct Answer: A
The reaction C2H5Br + NaOH → C2H4 + NaBr + H2O is an elimination reaction where a hydrogen and a halogen atom are removed, forming an alkene.
Q7
Medium
Which compound would undergo electrophilic aromatic substitution most readily?
A.
Benzene
B.
Toluene
C.
Nitrobenzene
D.
Chlorobenzene
Show Answer & Explanation
Correct Answer: B
Toluene undergoes electrophilic aromatic substitution more readily than benzene due to the electron-donating effect of the methyl group, which stabilizes the carbocation intermediate formed during the reaction.
Q8
Hard
Which of the following compounds is a primary alcohol?
A.
1-butanol
B.
2-butanol
C.
Cyclohexanol
D.
2-pentanol
Show Answer & Explanation
Correct Answer: A
1-butanol is a primary alcohol because it has the hydroxyl (-OH) group attached to a carbon that is only bonded to one other carbon, thus defining the primary classification.
Q9
Hard
In the reaction of ethene with bromine, what is the main product formed?
A.
Bromobutane
B.
Dibromoethane
C.
Bromoethane
D.
Ethyl bromide
Show Answer & Explanation
Correct Answer: B
The main product of the addition reaction between ethene and bromine is dibromoethane, as bromine adds across the double bond, resulting in two bromine atoms being incorporated.
Q10
Hard
What is the major product when 2-pentyne is treated with hydrogen in the presence of a palladium catalyst?
A.
Pentane
B.
2-Pentene
C.
3-Pentanol
D.
1-Pentanol
Show Answer & Explanation
Correct Answer: A
When 2-pentyne is treated with hydrogen in the presence of a palladium catalyst, it undergoes complete hydrogenation to form pentane. Palladium effectively catalyzes the addition of hydrogen across the triple bond, completely saturating the molecule.
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Organic Chemistry — Thanaweya Amma (Egypt) Thanaweya Chemistry Practice Questions Online
This page contains 137 practice MCQs for the chapter Organic Chemistry in Thanaweya Amma (Egypt) Thanaweya Chemistry. The questions are organized by difficulty — 37 easy, 69 medium, 31 hard — so you can choose the right level for your preparation.
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