Hydrocarbons Chapter-Wise Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the number of carbon atoms in heptane?

Heptane (\( \ce{C7H16} \)) is an alkane with 7 carbon atoms, as indicated by the prefix 'hept-'.

6
8
7
5
3

Which hydrocarbon with molecular formula \( \ce{C8H14} \) has three degrees of unsaturation and a ring?

Ethylbenzene (\( \ce{C6H5CH2CH3} \)) has a benzene ring (3 pi bonds), fitting \( \ce{C8H14} \) with three degrees of unsaturation.

Cyclooctene
Octadiyne
Ethylbenzene
Cyclooctane
3

Which hydrocarbon is used in the production of detergents?

Benzene (\( \ce{C6H6} \)) is a starting material for alkylbenzenes, which are used in detergent production.

Methane
Ethane
Propane
Benzene
4

Which hydrocarbon is used in the manufacture of explosives like TNT?

Toluene (\( \ce{C6H5CH3} \)), an aromatic hydrocarbon, is a precursor for trinitrotoluene (TNT), an explosive.

Methane
Benzene
Toluene
Ethane
3

Which substituent on a benzene ring deactivates it strongly and directs electrophiles to the meta position?

The \( -\ce{COOH} \) group is strongly electron-withdrawing, deactivating the ring and directing electrophiles to the meta position.

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

Which hydrocarbon is obtained by the destructive distillation of coal?

Coal gas, a mixture of hydrocarbons including methane, is obtained by the destructive distillation of coal.

Methane
Ethene
Propane
Butene
1

What is the source of natural gas found during oil drilling?

Natural gas, primarily methane, is found in the upper strata during the drilling of oil wells.

Upper strata of oil wells
Coal mines
Marshy areas
Petroleum refineries
1

Which hydrocarbon would produce the least amount of water per mole upon complete combustion?

Benzene (\( \ce{C6H6} \)) produces 3 moles of \( \ce{H2O} \) (\( \ce{2C6H6 + 15O2 -> 12CO2 + 6H2O} \)), less than alkanes like \( \ce{C5H12} \) (6 moles).

\( \ce{C5H12} \)
\( \ce{C6H14} \)
\( \ce{C6H6} \)
\( \ce{C4H10} \)
3

Which conformation of ethane is more stable?

The staggered conformation of ethane is more stable than the eclipsed conformation because the hydrogen atoms are farthest apart, reducing repulsion.

Eclipsed
Gauche
Skew
Staggered
4

Which of the following hydrocarbons has the highest boiling point?

Among alkanes, boiling point increases with molecular mass. Hexane (\( \ce{C6H14} \)) has the highest carbon count here.

\( \ce{CH4} \)
\( \ce{C2H6} \)
\( \ce{C6H14} \)
\( \ce{C3H8} \)
3

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