Hydrocarbons Chapter-Wise Test 19

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which hydrocarbon with 9 carbon atoms has a straight chain and the highest boiling point among its isomers?

Nonane (\( \ce{C9H20} \)), with a straight 9-carbon chain, has the highest boiling point among its isomers due to maximum surface area.

Nonane
2,2,3-Trimethylhexane
3-Ethylheptane
2,2,4-Trimethylhexane
1

What is the number of sigma bonds in benzene (\( \ce{C6H6} \))?

Benzene has 6 \( \ce{C-C} \) and 6 \( \ce{C-H} \) sigma bonds, totaling 12 sigma bonds, along with 3 pi bonds.

6
9
15
12
4

Which hydrocarbon requires 15/2 moles of \( \ce{O2} \) for complete combustion of 1 mole?

For \( \ce{C5H10} \) (cyclopentane): \( \ce{C5H10 + 15/2 O2 -> 5CO2 + 5H2O} \), requiring 15/2 \( \ce{O2} \) per mole.

\( \ce{C6H14} \)
\( \ce{C5H10} \)
\( \ce{C4H10} \)
\( \ce{C5H12} \)
2

Which hydrocarbon is used in the manufacture of perfumes?

Toluene (\( \ce{C6H5CH3} \)), an aromatic hydrocarbon, is used in the synthesis of compounds for perfumes.

Methane
Ethane
Propane
Toluene
4

How many isomers are possible for \( \ce{C5H12} \)?

For \( \ce{C5H12} \), a pentane molecule, there are 3 isomers: pentane, 2-methylbutane, and 2,2-dimethylpropane.

2
3
4
5
2

Which hydrocarbon is used as a refrigerant?

Propane (\( \ce{C3H8} \)), a low molecular weight alkane, is used as a refrigerant in some systems.

Methane
Benzene
Propane
Toluene
3

Which hydrocarbon with molecular formula \( \ce{C6H10} \) has two degrees of unsaturation and no rings?

Hexadiyne (\( \ce{CH#C-C#C-CH2-CH3} \)) has two triple bonds (2 degrees of unsaturation) and no rings, fitting \( \ce{C6H10} \).

Cyclohexene
Hexene
Hexadiyne
Benzene
3

What type of bonds are present in alkanes?

Alkanes are saturated hydrocarbons with only single covalent bonds between carbon and hydrogen atoms.

Single bonds
Double bonds
Triple bonds
Ionic bonds
1

A hydrocarbon with 10 carbon atoms has two methyl branches and one ethyl branch. What is its IUPAC name?

For \( \ce{C10H22} \), a 7-carbon chain (heptane) with methyl groups on 2 and 3 and an ethyl on 4 is 4-ethyl-2,3-dimethylheptane.

2,2,3-Trimethyloctane
4-Ethyl-2,3-dimethylheptane
3-Ethyl-2,2-dimethylheptane
2,3,4-Trimethylheptane
2

A hydrocarbon with 9 carbon atoms has three methyl branches. What is its IUPAC name?

For \( \ce{C9H20} \), a 6-carbon chain (hexane) with methyl groups on carbons 2, 3, and 4 is 2,3,4-trimethylhexane.

2,2,3-Trimethylhexane
2,3,4-Trimethylhexane
3,3-Dimethylheptane
2,2,4-Trimethylhexane
2

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