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Class 10 Practice Level 3 – Carbon and its Compounds – Set – 2

Total questions: 15

1.

Which of the following alkenes will react fastest with HBr?

Topic: Electrophilic Substitution

Ethene

Propene

1-Butene

2-Methylpropene

None

2.

Which of the following intermediates is formed during the nitration of benzene?

Topic: Reaction Intermediates

Benzyl carbocation

Phenyl radical

Nitronium ion

Benzyne

None

3.

Which of the following compounds does not exhibit aromaticity?

Topic: Aromatic Compounds

Pyrrole

Furan

Thiophene

Cycloheptatrienyl cation

None

4.

Which type of spectroscopy is most useful for determining the functional groups present in an organic molecule?

Topic: Spectroscopy

NMR spectroscopy

IR spectroscopy

UV-Vis spectroscopy

Mass spectrometry

None

5.

In the E2 elimination reaction, which factor does not influence the reaction rate?

Topic: Reaction Mechanisms

Strength of the base

Concentration of the substrate

Presence of a polar solvent

Leaving group ability

None

6.

Which conformation of cyclohexane is the most stable?

Topic: Conformational Analysis

Boat

Chair

Twist-boat

Half-chair

None

7.

Which reagent is used to convert a primary alcohol to an alkyl halide?

Topic: Organic Synthesis

KMnO₄

PCC

H₂SO₄

PBr₃

None

8.

Which of the following substituents on a benzene ring activates the ring towards electrophilic substitution?

Topic: Electrophilic Substitution

-NO₂

-CF₃

-NH₂

-CN

None

9.

Which of the following intermediates is formed during the Friedel-Crafts acylation of benzene?

Topic: Reaction Intermediates

Benzyl carbocation

Phenyl radical

Acylium ion

Benzyne

None

10.

What is the hybridization of carbon in the carbonyl group of a ketone?

Topic: Hybridization

sp

sp²

sp³

dsp²

None

11.

Which type of spectroscopy is most useful for determining the structure of a compound based on hydrogen environments?

Topic: Spectroscopy

NMR spectroscopy

IR spectroscopy

UV-Vis spectroscopy

Mass spectrometry

None

12.

Which reagent is used to selectively oxidize a primary alcohol to an aldehyde without further oxidation to a carboxylic acid?

Topic: Organic Synthesis

KMnO₄

PCC

H₂SO₄

LiAlH₄

None

13.

Which of the following reagents is used in the nitration of benzene?

Topic: Electrophilic Substitution

H₂SO₄

HNO₃

HNO₃/H₂SO₄

HCl/H₂O₂

None

14.

In an SN2 reaction, which factor increases the reaction rate?

Topic: Reaction Mechanisms

Steric hindrance

Strength of the leaving group

Polar protic solvent

Tertiary substrate

None

15.

Which conformation of 2-butene is more stable?

Topic: Conformational Analysis

Cis

Trans

Eclipsed

Staggered

None

1 out of 15

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