Hydrocarbons Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which substituent on a benzene ring is meta-directing?

The \( -\ce{NO2} \) group withdraws electron density from the ring, directing electrophiles to the meta position.

\( -\ce{CH3} \)
\( -\ce{NH2} \)
\( -\ce{NO2} \)
\( -\ce{OCH3} \)
3

Which hydrocarbon exhibits the greatest deviation from the boiling point trend of its homologous series due to branching?

For \( \ce{C5H12} \), 2,2-dimethylpropane has the most compact, spherical shape, significantly lowering its boiling point compared to pentane.

Pentane
2,2-Dimethylpropane
2-Methylbutane
Cyclopentane
2

Which of the following hydrocarbons is a starting material for dyes?

Higher hydrocarbons like toluene (\( \ce{C6H5CH3} \)) are used as starting materials for manufacturing dyes.

\( \ce{CH4} \)
\( \ce{C2H2} \)
\( \ce{C3H8} \)
\( \ce{C6H5CH3} \)
4

What is the bond angle in the tetrahedral structure of methane?

Methane (\( \ce{CH4} \)) has a tetrahedral structure due to \( sp^3 \) hybridization, with bond angles of 109.5°.

109.5°
120°
90°
180°
1

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

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

Cycloheptane
Heptyne
Toluene
Cycloheptadiene
4

Which hydrocarbon has a general formula of \( \ce{C_nH_{2n}} \)?

Alkenes are unsaturated hydrocarbons with one carbon-carbon double bond, following the general formula \( \ce{C_nH_{2n}} \).

Alkanes
Alkenes
Alkynes
Aromatics
2

What is the IUPAC name of \( \ce{CH3CH(CH3)CH2CH2CH3} \)?

The longest chain has 5 carbons (pentane), with a methyl group on the second carbon, making it 2-methylpentane.

3-Methylpentane
2-Methylpentane
Hexane
2,2-Dimethylbutane
2

Which hydrocarbon with molecular formula \( \ce{C6H10} \) is cyclic and has one degree of unsaturation?

Cyclohexene (\( \ce{C6H10} \)) is a six-membered ring with one double bond, giving one degree of unsaturation.

Cyclohexane
Hexyne
Benzene
Cyclohexene
4

Which hydrocarbon is classified as unsaturated?

Ethene (\( \ce{CH2=CH2} \)) contains a carbon-carbon double bond, making it an unsaturated hydrocarbon.

\( \ce{CH3CH-CH3} \)
\( \ce{CH3CH2CH3} \)
\( \ce{CH4} \)
\( \ce{CH2=CH2} \)
4

Which substituent on a benzene ring is strongly deactivating and meta-directing?

The \( -\ce{CN} \) group strongly withdraws electrons, deactivating the ring and directing electrophiles to the meta position.

\( -\ce{OH} \)
\( -\ce{CH3} \)
\( -\ce{Cl} \)
\( -\ce{CN} \)
4

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0