This section focuses on calculation-based, data-oriented, and analytical problems involving hydrocarbons. It is designed to help students apply theoretical knowledge of alkanes, alkenes, and alkynes to solve numerical and logic-based questions commonly asked in competitive and board examinations .
In this section, you will work on:
Molecular formula–based hydrocarbon identification
Degree of unsaturation calculations and interpretation
Numerical problems on isomer count and classification
Stoichiometric calculations involving hydrocarbon reactions
Combustion-based problems (CO₂, H₂O yield calculations)
Reaction yield and limiting reagent problems
Mixed numerical MCQs and integer-type questions
The problems are structured to enhance quantitative reasoning , improve structural visualization , and build confidence in handling non-theoretical organic chemistry questions .
Mastering numerical applications in hydrocarbons equips students to efficiently solve high-scoring calculation-based questions in school exams, JEE, NEET, and undergraduate assessments .
Q. What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?
A.
1-Pentene
B.
2-Pentene
C.
3-Pentene
D.
Butene
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Solution
The compound is named 2-pentene because the double bond is located between the second and third carbon atoms.
Correct Answer:
B
— 2-Pentene
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Q. What is the IUPAC name for the compound with the formula C5H12?
A.
Pentane
B.
Butane
C.
Hexane
D.
Propane
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Solution
The compound C5H12 is an alkane with five carbon atoms, which is named pentane.
Correct Answer:
A
— Pentane
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-C≡C-CH3?
A.
1-Pentyne
B.
2-Pentyne
C.
3-Pentyne
D.
Butyne
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Solution
The compound is named 2-pentyne because the triple bond is located between the second and third carbon atoms.
Correct Answer:
B
— 2-Pentyne
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Q. What is the IUPAC name of the compound with the formula C5H12?
A.
Pentane
B.
Butane
C.
Hexane
D.
Propane
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Solution
The compound C5H12 is an alkane with five carbon atoms, which is named pentane.
Correct Answer:
A
— Pentane
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Q. What is the major product of the reaction between 1-butyne and H2 in the presence of a catalyst?
A.
Butane
B.
Butene
C.
Cyclobutane
D.
1-Butyne
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Solution
The hydrogenation of 1-butyne in the presence of a catalyst produces butane as the major product.
Correct Answer:
A
— Butane
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Q. What is the molecular formula for 3-methyl-1-butyne?
A.
C5H10
B.
C5H8
C.
C6H10
D.
C6H12
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Solution
3-methyl-1-butyne has the molecular formula C5H8, as it contains a triple bond.
Correct Answer:
B
— C5H8
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Q. What is the product of the complete combustion of 2-butyne?
A.
C4H10 + CO2 + H2O
B.
C4H10 + CO + H2O
C.
CO2 + H2O
D.
C4H8 + O2
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Solution
The complete combustion of 2-butyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer:
C
— CO2 + H2O
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Q. What is the product of the reaction between ethene and bromine?
A.
Bromoethane
B.
1,2-Dibromoethane
C.
Ethane
D.
Ethyl bromide
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Solution
The reaction between ethene and bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer:
B
— 1,2-Dibromoethane
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Q. What is the product of the reaction of 2-pentyne with water in the presence of sulfuric acid?
A.
2-Pentanol
B.
3-Pentanol
C.
Pentanal
D.
Pentanoic acid
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Solution
The hydration of 2-pentyne in the presence of sulfuric acid leads to the formation of 3-pentanol.
Correct Answer:
B
— 3-Pentanol
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Q. Which of the following is the correct formula for an alkane?
A.
C_nH_{2n}
B.
C_nH_{2n+2}
C.
C_nH_{2n-2}
D.
C_nH_{2n+1}OH
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Solution
The general formula for alkanes is C_nH_{2n+2}, where n is the number of carbon atoms.
Correct Answer:
B
— C_nH_{2n+2}
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