Organic Chemistry Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 139 free MCQs with instant results and detailed explanations.
139
Total
34
Easy
76
Medium
29
Hard
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Sample Questions from Organic Chemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is the functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
Show Answer & Explanation
Correct Answer: A
Alcohols contain a hydroxyl functional group (-OH), making option A the correct answer. The other options represent carboxylic acids (-COOH), amines (-NH2), and aldehydes (-CHO), which are different functional groups.
Q2
Easy
Which compound is an example of an alkane?
A.
C2H6
B.
C2H4
C.
C3H6O
D.
C4H8
Show Answer & Explanation
Correct Answer: A
Alkanes are saturated hydrocarbons with the general formula CnH2n+2. C2H6 (ethane) follows this formula, while C2H4 (ethylene) is an alkene, C3H6O is a ketone, and C4H8 is an alkene as well.
Q3
Easy
What is the main product of the dehydration of ethanol?
A.
Ethene
B.
Ethanol
C.
Acetic acid
D.
Butanol
Show Answer & Explanation
Correct Answer: A
The dehydration of ethanol (removal of water) typically produces ethene through an elimination reaction. Ethanol itself is not produced again, acetic acid is unrelated, and butanol is a different alcohol.
Q4
Medium
Which of the following compounds contains a carbon-carbon double bond?
A.
Ethylene
B.
Cyclohexane
C.
Butane
D.
Propane
Show Answer & Explanation
Correct Answer: A
Ethylene, or ethene, is an alkene that contains a carbon-carbon double bond (C=C). The other options are either alkanes or cyclic compounds without double bonds.
Q5
Medium
What is the IUPAC name of the following compound: CH3-CH2-CH(CH3)-CH2OH?
A.
2-Butanol
B.
3-Pentanol
C.
2-Pentanol
D.
3-Butanol
Show Answer & Explanation
Correct Answer: B
The longest carbon chain has five carbons, and the hydroxyl group is on the third carbon. Therefore, it is named 3-pentanol.
Q6
Medium
What type of reaction occurs when an alkene reacts with bromine?
A.
Addition Reaction
B.
Substitution Reaction
C.
Elimination Reaction
D.
Oxidation Reaction
Show Answer & Explanation
Correct Answer: A
When an alkene reacts with bromine, it undergoes an addition reaction, resulting in the formation of a dibrominated alkane by adding bromine across the double bond.
Q7
Medium
Which of the following is a characteristic feature of aromatic compounds?
A.
Presence of a carbonyl group
B.
Planar structure with delocalized pi electrons
C.
High reactivity with nucleophiles
D.
Predominantly saturated carbon chains
Show Answer & Explanation
Correct Answer: B
Aromatic compounds are characterized by their planar structure and the delocalization of pi electrons, which contributes to their stability and unique chemical properties.
Q8
Hard
Which of the following compounds has the highest boiling point due to hydrogen bonding?
A.
Ethanol (C2H5OH)
B.
Dimethyl ether (C2H6O)
C.
Acetic acid (C2H4O2)
D.
Propane (C3H8)
Show Answer & Explanation
Correct Answer: C
Acetic acid has the highest boiling point due to its ability to form strong hydrogen bonds between molecules, which increases the energy required to convert it to gas. Ethanol also forms hydrogen bonds but is less effective than acetic acid due to its molecular structure.
Q9
Hard
What is the correct IUPAC name for the compound with the formula C5H10 that contains a double bond?
A.
Pentane
B.
Pentene
C.
Cyclopentene
D.
1-Pentene
Show Answer & Explanation
Correct Answer: D
The compound C5H10 is an alkene due to the presence of a double bond. The correct IUPAC name is '1-Pentene' since it indicates that the double bond starts at the first carbon in the straight-chain configuration.
Q10
Hard
Which of the following compounds has the highest boiling point due to strong intermolecular forces?
A.
1-butanol
B.
2-methylpropane
C.
Cyclohexane
D.
Hexane
Show Answer & Explanation
Correct Answer: A
1-butanol has a hydroxyl (-OH) group that allows for hydrogen bonding, significantly increasing its boiling point compared to the other compounds, which do not engage in hydrogen bonding.
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Organic Chemistry — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 139 practice MCQs for the chapter Organic Chemistry in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 34 easy, 76 medium, 29 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.