Hydrocarbons Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the IUPAC name of the compound formed by attaching an \( -\ce{OH} \) group to the second carbon of \( \ce{CH3CH2CH2CH3} \)?

The parent chain is butane (4 carbons), and the \( -\ce{OH} \) group on the second carbon gives butan-2-ol.

But invisible-1-ol
Pentan-2-ol
Butan-2-ol
Butan-3-ol
3

Which of the following is a cyclic saturated hydrocarbon?

Cycloalkanes are saturated hydrocarbons with a closed ring structure, e.g., cyclohexane (\( \ce{C6H12} \)).

\( \ce{C6H6} \)
\( \ce{C6H12} \)
\( \ce{C2H4} \)
\( \ce{C4H6} \)
2

Which hydrocarbon class exhibits the lowest reactivity under normal conditions?

Alkanes, with only strong \( \ce{C-C} \) and \( \ce{C-H} \) single bonds, are the least reactive due to their stability, often called paraffins.

Alkanes
Alkenes
Alkynes
Aromatics
1

Which hydrocarbon with molecular formula \( \ce{C7H10} \) has a ring and two degrees of unsaturation?

Cycloheptadiene (\( \ce{C7H10} \)) has a seven-membered ring with two double bonds, giving two degrees of unsaturation.

Heptyne
Toluene
Cycloheptadiene
Cycloheptene
3

Which substituent on a benzene ring would cause the greatest increase in electron density at the ortho and para positions?

The \( -\ce{NH2} \) group is a strong electron donor via resonance, significantly increasing electron density at ortho and para positions.

\( -\ce{Cl} \)
\( -\ce{CH3} \)
\( -\ce{NH2} \)
\( -\ce{OH} \)
3

Which hydrocarbon with 7 carbon atoms has a straight chain and the highest boiling point among its isomers?

Heptane (\( \ce{C7H16} \)), with a straight 7-carbon chain, has the highest boiling point among \( \ce{C7H16} \) isomers due to maximum surface area.

Heptane
2,2,3-Trimethylbutane
3-Methylhexane
2,3-Dimethylpentane
1

Which hydrocarbon with molecular formula \( \ce{C8H18} \) has the longest straight chain possible?

Octane (\( \ce{CH3(CH2)6CH3} \)) has an 8-carbon straight chain, the longest possible for \( \ce{C8H18} \), unlike branched isomers.

2,2,3-Trimethylpentane
2,2-Dimethylhexane
Octane
3-Methylheptane
3

Which hydrocarbon with 6 carbon atoms has the maximum number of pi bonds?

Benzene (\( \ce{C6H6} \)) has 3 pi bonds in its delocalized system, the maximum for 6 carbons, compared to hexadiyne (2 pi bonds).

Hexane
Cyclohexene
Hexadiyne
Benzene
4

Which hydrocarbon with 11 carbon atoms has the maximum possible branching and the lowest boiling point among its isomers?

For \( \ce{C11H24} \), 2,2,3,3,4-pentamethylhexane has five methyl branches, the most compact structure, lowering its boiling point the most.

Undecane
2-Methylundecane
2,2-Dimethyldecane
2,2,3,3,4-Pentamethylhexane
4

Which hydrocarbon is a major component of kerosene?

Kerosene contains hydrocarbons with 10-16 carbons, such as decane (\( \ce{C10H22} \)), obtained from petroleum.

Methane
Decane
Ethane
Benzene
2

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