Hydrocarbons Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which hydrocarbon is a major source of energy?

Petrol, a mixture of hydrocarbons like heptane (\( \ce{C7H16} \)), is a major energy source for automobiles.

\( \ce{C2H2} \)
\( \ce{C6H6} \)
\( \ce{C4H8} \)
\( \ce{C7H16} \)
4

What is the shape of the carbon framework in alkanes?

Due to \( sp^3 \) hybridization, the carbon atoms in alkanes adopt a tetrahedral shape around each carbon.

Tetrahedral
Linear
Trigonal planar
Octahedral
1

What type of isomerism is exhibited by alkanes due to free rotation along \( \ce{C-C} \) bonds?

Alkanes show conformational isomerism due to free rotation along \( \ce{C-C} \) sigma bonds, as seen in staggered and eclipsed forms of ethane.

Geometrical
Structural
Conformational
Optical
3

Which hydrocarbon is obtained by the fractional distillation of petroleum?

Petrol, a mixture of hydrocarbons including pentane (\( \ce{C5H12} \)), is obtained by fractional distillation of petroleum.

Methane
Pentane
Ethyne
Cyclohexane
2

Which hydrocarbon with 6 carbon atoms has the highest density at room temperature?

Benzene (\( \ce{C6H6} \)), a liquid with density ~0.88 g/cm³, is denser than hexane (\( \ce{C6H14} \), ~0.66 g/cm³) at room temperature.

Hexane
Cyclohexane
Benzene
Hexene
3

Which substituent on a benzene ring would result in the least reactive ring towards electrophilic substitution?

The \( -\ce{SO3H} \) group is strongly electron-withdrawing, significantly deactivating the benzene ring towards electrophilic substitution.

\( -\ce{CH3} \)
\( -\ce{SO3H} \)
\( -\ce{OH} \)
\( -\ce{Cl} \)
2

Which hydrocarbon is obtained from the anaerobic decomposition of organic matter?

Methane (\( \ce{CH4} \)) is produced during the anaerobic decomposition of organic matter, as in biogas.

Methane
Ethene
Benzene
Propane
1

Which hydrocarbon with molecular formula \( \ce{C8H16} \) has a cyclic structure with one degree of unsaturation?

Cyclooctene (\( \ce{C8H16} \)) is an eight-membered ring with one double bond, giving one degree of unsaturation.

Octane
Cyclooctane
Octyne
Cyclooctene
4

Which hydrocarbon has the highest density among the following at room temperature?

Benzene (\( \ce{C6H6} \)), a liquid with density ~0.88 g/cm³, is denser than gaseous alkanes like \( \ce{C4H10} \) or \( \ce{C5H12} \).

\( \ce{C4H10} \)
\( \ce{C5H12} \)
\( \ce{C6H14} \)
\( \ce{C6H6} \)
4

What type of hydrocarbon is \( \ce{C3H6} \)?

\( \ce{C3H6} \) follows the general formula \( \ce{C_nH_{2n}} \), indicating it is an alkene with a double bond.

Alkane
Alkyne
Alkene
Aromatic
3

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