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Hydrocarbons Practice Questions

JEE · Chemistry · 1193 free MCQs with instant results and detailed explanations.

1193
Total
244
Easy
531
Medium
418
Hard

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Topics in Hydrocarbons

Alkanes 156
Alkenes 167
Alkynes 169
Aromatic Hydrocarbons 184
Benzene Reactions 182
Conformations 177
Geometrical Isomerism 158

Sample Questions from Hydrocarbons

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
Which of the following is the general formula for alkanes?
A. C_nH_(2n+2)
B. C_nH_(2n)
C. C_nH_(2n-2)
D. C_nH_n
Show Answer & Explanation
Correct Answer: A
The general formula for alkanes is C_nH_(2n+2), where 'n' is the number of carbon atoms.
Q2
Easy
What is the name of the straight-chain alkane with 5 carbon atoms?
A. Pentane
B. Butane
C. Hexane
D. Octane
Show Answer & Explanation
Correct Answer: A
The straight-chain alkane with five carbon atoms is called Pentane.
Q3
Easy
Which of the following alkanes is a gas at room temperature?
A. Decane
B. Nonane
C. Pentane
D. Hexadecane
Show Answer & Explanation
Correct Answer: C
Pentane is a gas at room temperature while the others are liquids or solids.
Q4
Medium
Which of the following is the molecular formula of the alkane with 5 carbon atoms?
A. C5H12
B. C5H10
C. C5H14
D. C5H8
Show Answer & Explanation
Correct Answer: A
The general formula for alkanes is CnH2n+2. For n=5, the formula is C5H12.
Q5
Medium
What is the IUPAC name of the compound with the formula C4H10?
A. Butane
B. Butene
C. Butyne
D. Propane
Show Answer & Explanation
Correct Answer: A
C4H10 is an alkane with 4 carbon atoms, which is named Butane according to IUPAC nomenclature.
Q6
Medium
Which of the following alkanes can exhibit geometric isomerism?
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Show Answer & Explanation
Correct Answer: C
C4H10 can exist in two structural forms, n-butane and isobutane, allowing for geometric isomerism.
Q7
Medium
What is the main product of the complete combustion of propane (C3H8)?
A. Carbon dioxide and water
B. Carbon and hydrogen
C. Methane and water
D. Oxygen and carbon dioxide
Show Answer & Explanation
Correct Answer: A
The complete combustion of alkanes like propane produces carbon dioxide and water.
Q8
Hard
Which of the following alkanes has the highest boiling point?
A. C10H22
B. C6H14
C. C8H18
D. C4H10
Show Answer & Explanation
Correct Answer: A
Boiling points of alkanes increase with molecular weight due to increased van der Waals forces. C10H22 has the highest molecular weight.
Q9
Hard
What is the mechanism of combustion of alkanes in excess oxygen?
A. Nucleophilic substitution
B. Electrophilic addition
C. Free radical chain reaction
D. Addition-elimination reaction
Show Answer & Explanation
Correct Answer: C
Combustion of alkanes involves a free radical chain reaction where alkanes react with oxygen producing CO2 and H2O.
Q10
Hard
Which reaction results in the formation of a cyclic alkane from an alkene?
A. Hydrogenation
B. Hydrohalogenation
C. Diels-Alder Reaction
D. Oxidation
Show Answer & Explanation
Correct Answer: C
The Diels-Alder reaction is a cycloaddition reaction where a conjugated diene and a dienophile form a cyclic compound.

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Hydrocarbons — JEE Chemistry Practice Questions Online

This page contains 1193 practice MCQs for the chapter Hydrocarbons in JEE Chemistry. The questions are organized by difficulty — 244 easy, 531 medium, 418 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. This chapter covers 7 topics, giving you comprehensive coverage of the entire chapter.