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Hydrocarbons Practice Questions

NEET · Chemistry · 1498 free MCQs with instant results and detailed explanations.

1498
Total
304
Easy
660
Medium
534
Hard

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Topics in Hydrocarbons

Alkanes 366
Alkynes 360
Aromatic Hydrocarbons 388
Alkenes 384

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_3
Show Answer & Explanation
Correct Answer: A
The general formula for alkanes is C_nH_(2n+2), where 'n' is the number of carbon atoms. This formula indicates that for each carbon atom, there are two additional hydrogen atoms plus two more.
Q2
Easy
What is the IUPAC name of the alkane with the formula C5H12?
A. Butane
B. Pentane
C. Hexane
D. Propane
Show Answer & Explanation
Correct Answer: B
The alkane C5H12 has five carbon atoms, which corresponds to the IUPAC name 'Pentane'. The names of alkanes are determined by the number of carbon atoms they contain.
Q3
Easy
Which of the following alkanes is a gas at room temperature?
A. Ethane
B. Butane
C. Octane
D. Decane
Show Answer & Explanation
Correct Answer: A
Ethane is a gas at room temperature, while butane, octane, and decane are liquids or solids at that temperature due to their larger molecular size and higher boiling points.
Q4
Medium
What is the IUPAC name of the following alkane: CH3-CH2-CH2-CH(CH3)-CH2-CH3?
A. 3-Methylhexane
B. 2-Methylhexane
C. 2,3-Dimethylpentane
D. 3-Ethylpentane
Show Answer & Explanation
Correct Answer: A
The longest carbon chain contains 6 carbons (hexane), with a methyl group on the third carbon, making it 3-methylhexane.
Q5
Medium
Which of the following reactions is an example of a combustion reaction involving alkanes?
A. C3H8 + 5 O2 → 3 CO2 + 4 H2O
B. C2H6 + Cl2 → C2H5Cl + HCl
C. C4H10 + H2 → C4H12
D. C5H12 + C2H4 → C7H14
Show Answer & Explanation
Correct Answer: A
The equation C3H8 + 5 O2 → 3 CO2 + 4 H2O represents the complete combustion of propane, releasing energy.
Q6
Medium
Which alkane is expected to have the lowest density?
A. C1H4
B. C3H8
C. C5H12
D. C10H22
Show Answer & Explanation
Correct Answer: A
C1H4 (methane) is the smallest alkane and has the lowest molecular weight, resulting in the lowest density compared to the others listed.
Q7
Medium
In which of the following alkanes will you find a chiral center?
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Show Answer & Explanation
Correct Answer: C
C4H10 (butane) contains an isomer, 2-methylpropane, which has a chiral center due to a carbon bonded to four different substituents.
Q8
Hard
Which of the following alkanes cannot exhibit geometric isomerism?
A. Butane
B. Pentene
C. Hexene
D. Cyclohexane
Show Answer & Explanation
Correct Answer: A
Butane is a straight-chain alkane with no possibility of geometric isomers, as it lacks the necessary double bonds or restricted rotation.
Q9
Hard
What is the major product of the complete combustion of 2-methylpropane (isobutane)?
A. Carbon dioxide and water
B. Carbon monoxide and water
C. Soot and water
D. Methane and water
Show Answer & Explanation
Correct Answer: A
The complete combustion of 2-methylpropane leads to its reaction with oxygen to form carbon dioxide and water, which is typical for alkanes under complete combustion conditions.
Q10
Hard
Which reaction type best describes the conversion of an alkane to an alkyl halide?
A. Hydrogenation
B. Halogenation
C. Dehydrogenation
D. Hydrolysis
Show Answer & Explanation
Correct Answer: B
Halogenation is the substitution reaction where an alkane reacts with halogens (like Cl2 or Br2) to form alkyl halides, typically in the presence of UV light.

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Hydrocarbons — NEET Chemistry Practice Questions Online

This page contains 1498 practice MCQs for the chapter Hydrocarbons in NEET Chemistry. The questions are organized by difficulty — 304 easy, 660 medium, 534 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 4 topics, giving you comprehensive coverage of the entire chapter.