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Class 10 Practice Level 3 – Carbon and its Compounds – Set – 1

Total questions: 15

1.

Which type of reaction mechanism involves the addition of a nucleophile to an electrophilic carbon center?

Topic: Reaction Mechanisms

Electrophilic addition

Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

None

2.

Which of the following compounds are not structural isomers?

Topic: Structural Isomerism

Butane and Isobutane

Propanol and Propanoic acid

Ethanol and Dimethyl ether

1-Butene and 2-Butene

None

3.

What is the hybridization of the central carbon atom in allene (C₃H₄)?

Topic: Hybridization

sp

sp²

sp³

sp² and sp

None

4.

Which reagent would most likely undergo electrophilic addition with an alkene?

Topic: Electrophilic Addition

HCl

NaOH

NH₃

C₆H₆

None

5.

Which of the following steps is the rate-determining step in the SN1 reaction mechanism?

Topic: Reaction Mechanisms

Formation of the carbocation intermediate

Attack of the nucleophile on the carbocation

Loss of a leaving group

Formation of the transition state

None

6.

Which of the following compounds is not considered aromatic?

Topic: Aromatic Compounds

Benzene

Toluene

Cyclooctatetraene

Naphthalene

None

7.

Which conformation of ethane is the most stable?

Topic: Conformational Analysis

Eclipsed

Staggered

Gauche

Anti

None

8.

Which reagent is commonly used to oxidize primary alcohols to aldehydes?

Topic: Organic Synthesis

KMnO₄

PCC

H₂SO₄

LiAlH₄

None

9.

Which type of reaction mechanism involves the homolytic cleavage of a bond to form free radicals?

Topic: Reaction Mechanisms

Electrophilic addition

Nucleophilic substitution

Electrophilic substitution

Free radical substitution

None

10.

Which spectroscopic technique is used to determine the molecular mass of an organic compound?

Topic: Spectroscopy

NMR spectroscopy

IR spectroscopy

UV-Vis spectroscopy

Mass spectrometry

None

11.

Which reagent would most likely undergo electrophilic substitution with benzene?

Topic: Electrophilic Substitution

HBr

NaOH

Br₂/FeBr₃

CH₄

None

12.

Which of the following intermediates is formed during the addition of HBr to propene?

Topic: Reaction Intermediates

Carbocation

Carbanion

Free radical

Carbenium ion

None

13.

Which conformation of butane has the highest energy?

Topic: Conformational Analysis

Eclipsed

Staggered

Gauche

Anti

None

14.

Which reagent is commonly used to reduce aldehydes to primary alcohols?

Topic: Organic Synthesis

KMnO₄

PCC

H₂SO₄

NaBH₄

None

15.

Which of the following compounds follows Hückel's rule for aromaticity?

Topic: Aromatic Compounds

Cyclobutadiene

Cyclooctatetraene

Pyridine

Cyclopentadiene

None

1 out of 15

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