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  4. Hydrocarbons Chapter-Wise Test 3

Hydrocarbons Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

How many isomers are possible for the molecular formula \( \ce{C4H10} \)?

For \( \ce{C4H10} \), the carbon atoms can be arranged as a straight chain (butane) or a branched chain (2-methylpropane). Thus, there are 2 possible isomers.

2
3
4
1
1

Which hydrocarbon with molecular formula \( \ce{C5H10} \) has a five-membered ring and no double bonds?

Cyclopentane (\( \ce{C5H10} \)) is a saturated cycloalkane with a five-membered ring, fitting \( \ce{C_nH_{2n}} \) for cyclic compounds.

Pentene
Cyclopentane
Cyclopentene
Methylcyclobutane
2

Which hydrocarbon is used in the manufacture of polystyrene?

Hydrocarbons are used to produce polymers, and styrene (an aromatic hydrocarbon derivative) leads to polystyrene, indirectly linked to benzene.

Benzene
Methane
Ethane
Propane
1

Which substituent on a benzene ring would direct an electrophile to the meta position with the strongest deactivating effect?

The \( -\ce{NO2} \) group is a strong electron-withdrawing group via resonance and induction, deactivating the ring and directing to meta positions.

\( -\ce{CH3} \)
\( -\ce{NO2} \)
\( -\ce{Cl} \)
\( -\ce{OH} \)
2

Which substituent on a benzene ring is ortho-para directing due to hyperconjugation?

The \( -\ce{CH2CH3} \) (ethyl) group donates electrons via hyperconjugation, directing electrophiles to ortho and para positions.

\( -\ce{NO2} \)
\( -\ce{COOH} \)
\( -\ce{CH2CH3} \)
\( -\ce{CN} \)
3

What is the common name of \( \ce{CH3C6H5} \)?

The compound \( \ce{CH3C6H5} \) is an aromatic hydrocarbon with a methyl group on a benzene ring, commonly called toluene.

Benzene
Toluene
Xylene
Phenol
2

Which substituent on a benzene ring deactivates it moderately and directs electrophiles to ortho and para positions?

The \( -\ce{Cl} \) group is moderately deactivating due to its -I effect but directs to ortho and para positions via resonance.

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

Which hydrocarbon is used as a fuel in automobiles with less pollution?

CNG (compressed natural gas), primarily methane (\( \ce{CH4} \)), is used in automobiles and causes less pollution than petrol or diesel.

Butane
Benzene
Methane
Hexane
3

Which of the following hydrocarbons has the lowest boiling point?

Among alkanes, boiling point decreases with lower molecular mass. Methane (\( \ce{CH4} \)) has the lowest carbon count here.

\( \ce{C4H10} \)
\( \ce{C3H8} \)
\( \ce{CH4} \)
\( \ce{C5H12} \)
3

What is the number of hydrogen atoms in the compound \( \ce{CH3CH2CH2CH2CH3} \)?

The compound is pentane (\( \ce{C5H12} \)), with 5 carbons and 12 hydrogens, following the alkane formula \( \ce{C_nH_{2n+2}} \).

10
14
8
12
4

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