Hydrocarbons Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of hydrocarbon is benzene?

Benzene (\( \ce{C6H6} \)) is an aromatic hydrocarbon due to its cyclic structure and delocalized π electrons.

Aromatic
Alkane
Alkene
Alkyne
1

Which of the following is a property of aromatic hydrocarbons?

Aromatic hydrocarbons like benzene exhibit high stability due to their delocalized π electron system.

Low stability
High stability
High polarity
Reacts with water
2

Which hydrocarbon burns with a non-sooty flame?

Methane (\( \ce{CH4} \)), with a low carbon-to-hydrogen ratio, burns with a non-sooty blue flame due to complete combustion.

Benzene
Methane
Toluene
Ethene
2

Which hydrocarbon produces cyclohexane upon hydrogenation under vigorous conditions?

Benzene (\( \ce{C6H6} \)) undergoes addition of hydrogen under high temperature/pressure with a nickel catalyst to form cyclohexane (\( \ce{C6H12} \)).

\( \ce{C2H2} \)
\( \ce{C4H10} \)
\( \ce{C6H6} \)
\( \ce{C3H6} \)
3

Which hydrocarbon with molecular formula \( \ce{C5H8} \) contains a triple bond and no rings?

Pentyne (\( \ce{CH3CH2C#CH} \)) is an alkyne with a triple bond, fitting \( \ce{C5H8} \) (\( \ce{C_nH_{2n-2}} \)), and has no cyclic structure.

Pentyne
Cyclopentene
Pentadiene
Methylcyclobutane
1

Which hydrocarbon is the simplest alkane?

Methane (\( \ce{CH4} \)) is the simplest alkane with one carbon atom and four hydrogen atoms.

Methane
Ethane
Propane
Butane
1

How many carbon atoms are present in the longest chain of \( \ce{CH3CH2C(CH3)2CH3} \)?

The longest continuous chain is 5 carbons: \( \ce{CH3-CH2-C(CH3)2-CH3} \), making it a pentane derivative.

4
6
3
5
4

Which of the following is a carcinogenic hydrocarbon?

Polynuclear hydrocarbons like 1,2-benzanthracene, formed from incomplete combustion, are known to be carcinogenic.

\( \ce{CH4} \)
\( \ce{C2H4} \)
\( \ce{C6H6} \)
1,2-Benzanthracene
4

Which hydrocarbon is a starting material for synthetic fibers?

Benzene (\( \ce{C6H6} \)) is used in the production of synthetic fibers like nylon via intermediates.

Methane
Ethane
Propane
Benzene
4

Which hydrocarbon with molecular formula \( \ce{C6H12} \) is saturated and cyclic?

Cyclohexane (\( \ce{C6H12} \)) is a saturated cycloalkane with a six-membered ring, fitting \( \ce{C_nH_{2n}} \) for cyclic compounds.

Hexene
Cyclohexane
Benzene
Cyclohexene
2

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