Hydrocarbons Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which hydrocarbon produces the highest number of \( \ce{H2O} \) molecules per mole upon complete combustion among the following?

Octane (\( \ce{C8H18} \)) produces 9 moles of \( \ce{H2O} \) (\( \ce{C8H18 + 25/2 O2 -> 8CO2 + 9H2O} \)), the highest among the options.

\( \ce{C6H14} \)
\( \ce{C5H12} \)
\( \ce{C8H18} \)
\( \ce{C7H16} \)
3

Which of the following hydrocarbons is used as a solvent for paints?

Higher hydrocarbons, such as hexane (\( \ce{C6H14} \)), are used as solvents for paints due to their non-polar nature.

Methane
Hexane
Ethene
Benzene
2

A hydrocarbon has 6 carbon atoms and 6 hydrogen atoms. How many pi bonds does it contain?

Benzene (\( \ce{C6H6} \)) has 3 pi bonds in its delocalized π system, with 12 sigma bonds (6 \( \ce{C-C} \), 6 \( \ce{C-H} \)).

1
2
3
4
3

Which hydrocarbon is used as a fuel in LPG cylinders?

LPG (liquefied petroleum gas) contains a mixture of propane (\( \ce{C3H8} \)) and butane, with propane being a key component.

Methane
Ethane
Benzene
Propane
4

Which hydrocarbon is the primary component of LPG?

LPG (liquefied petroleum gas) is a mixture of hydrocarbons, primarily butane (\( \ce{C4H10} \)) and propane, used as a domestic fuel.

Butane
Methane
Ethene
Benzene
1

Which hydrocarbon produces 7 moles of \( \ce{CO2} \) and 8 moles of \( \ce{H2O} \) per mole upon complete combustion?

For \( \ce{C7H16} \) (heptane): \( \ce{C7H16 + 11O2 -> 7CO2 + 8H2O} \), producing 7 \( \ce{CO2} \) and 8 \( \ce{H2O} \).

\( \ce{C7H16} \)
\( \ce{C6H14} \)
\( \ce{C8H18} \)
\( \ce{C7H14} \)
1

Which hydrocarbon is a constituent of biogas?

Biogas, produced from organic waste, primarily contains methane (\( \ce{CH4} \)), a simple alkane.

Methane
Ethene
Propane
Benzene
1

What is the IUPAC name of the compound \( \ce{CH3C(CH3)3} \)?

The longest chain has 4 carbons, with three methyl groups on the second carbon, making it 2,2-dimethylpropane.

2,2-Dimethylpropane
2-Methylbutane
Pentane
3-Methylbutane
1

What is the IUPAC name of \( \ce{CH3CH(OH)CH2CH3} \)?

The longest chain has 4 carbons (butane), with an \( -\ce{OH} \) group on the second carbon, making it butan-2-ol.

Butan-1-ol
Butan-2-ol
Pentan-2-ol
2-Methylpropan-1-ol
2

A hydrocarbon with 6 carbon atoms forms a ring and has 8 hydrogen atoms. What is its IUPAC name?

\( \ce{C6H8} \) with a ring suggests two degrees of unsaturation. Cyclohexadiene, with two double bonds, fits this description.

Cyclohexadiene
Cyclohexene
Benzene
Cyclohexane
1

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