Are the practice questions for Organic Chemistry – Some Basic Principles and Techniques free?

Yes. Every chapter includes free practice questions for Class 11 - Science students to get you started.

What types of questions are included?

The practice set for Organic Chemistry – Some Basic Principles and Techniques mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Organic Chemistry – Some Basic Principles and Techniques for full coverage.

How many practice questions are there for Organic Chemistry – Some Basic Principles and Techniques?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Organic Chemistry – Some Basic Principles and Techniques Class 11 Chemistry Practice Questions with Answers

easy

Describe the principle of sublimation as a purification technique. When is this method useful?

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easy

Demonstrate the bond-line formula for 3-Ethyl-2-methylpentane.

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easy

Name the Swedish chemist who proposed the 'vital force' theory for the formation of organic compounds.

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easy

Analyze whether water (

H_2O

) acts as a nucleophile or an electrophile. Provide a reason.

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easy

What is a homologous series?

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easy

Explain the concept of tetravalence of carbon and its relation to hybridisation.

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easy

Define a functional group.

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easy

Analyze the hybridization state of each carbon atom in the molecule propyne,

CH_{3}-C\equiv CH

.

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medium

Describe the principle of simple distillation. Explain under what conditions fractional distillation is preferred over simple distillation.

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medium

An organic compound has the structure

HOCH_2CH_2COCH_3

. (a) Calculate its IUPAC name. (b) Justify the numbering of the carbon chain based on the priority of functional groups.

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medium

Justify the observed order of acidity:

HCOOH > CH_3COOH > CH_3CH_2COOH

. Your explanation must be based on electronic displacement effects.

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medium

Design a flowchart to separate a mixture of a volatile solid (camphor), a non-volatile salt (sodium chloride), and a steam-volatile liquid (aniline).

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medium

Critique the single Lewis structure representation of benzene based on its bond lengths and chemical reactivity. Formulate the resonance hybrid structure of benzene and justify how this model successfully explains the following observations: (a) all C-C bonds are of equal length, and (b) benzene undergoes substitution reactions rather than addition reactions.

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medium

A student named the compound

CH_3-CH(OCH_3)-CH_2-COOH

as '3-methoxybutanoic acid'. Critique this name according to IUPAC rules, provide the correct name, and justify the numbering of the parent chain.

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medium

An organic compound with the molecular formula

C_4H_8O

can exist as both an aldehyde and a ketone. Formulate the structures of one aldehyde and one ketone isomer. Justify which of these would likely have a higher boiling point and propose a chemical test to distinguish between them.

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medium

In the Dumas method for nitrogen estimation, an organic compound (

0.45

g) produced

52.43

mL of nitrogen at STP. Propose a calculation to determine if the compound could be urea (

NH_2CONH_2

, Molar Mass = 60 g/mol).

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medium

Explain the following types of structural isomerism with one example for each: (a) Position Isomerism (b) Functional Group Isomerism (c) Metamerism

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medium

Compare the stability of a tertiary butyl carbocation,

(CH_3)_3C^+

, and an isopropyl carbocation,

(CH_3)_2CH^+

. Justify your answer.

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medium

List two commonly used adsorbents in adsorption chromatography.

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medium

Describe three different ways to represent the structure of an organic molecule, using ethane (

\text{C}_2\text{H}_6

) as an example.

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medium

Analyze the principle behind separating a mixture using paper chromatography. How is the retardation factor (

R_f

) calculated, and what does a lower

R_f

value for a component signify?

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medium

(a) Demonstrate the structures and provide IUPAC names for two position isomers of pentanol (

C_5H_{12}O

). (b) Demonstrate the structure and provide the IUPAC name for a functional isomer of pentan-1-ol that is an ether. (c) Compare the boiling points of pentan-1-ol and the ether isomer you drew, providing a clear reason for the difference.

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medium

Examine the molecule propanal,

CH_3CH_2CHO

, and identify the electrophilic center. Justify your selection.

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medium

Evaluate the concepts of hyperconjugation and inductive effect. Using these concepts, justify the stability order of alkenes:

R_2C=CR_2 > R_2C=CHR > RCH=CHR > RCH=CH_2 > CH_2=CH_2

. Create bond-line structures for 2,3-dimethylbut-2-ene and propene to illustrate your justification.

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medium

Justify why a tertiary carbocation,

(CH_3)_3C^+

, is planar while a tertiary carbanion,

(CH_3)_3C:^-

, is pyramidal.

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medium

Contrast heterolytic and homolytic bond cleavage by demonstrating the fission of the C–Br bond in bromoethane (

CH_3CH_2Br

). Show the electron flow using curved arrows and identify the reactive intermediates formed in each process.

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medium

Critique the statement: 'All stereoisomers are also structural isomers.' Justify your answer with a suitable example.

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medium

Define and explain chain isomerism with a suitable example.

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medium

Define homolytic cleavage of a covalent bond.

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medium

On complete combustion,

0.20

g of an organic compound produced

0.374

g of carbon dioxide and

0.153

g of water. Calculate the percentage composition of carbon and hydrogen in the compound.

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medium

Apply IUPAC nomenclature rules to draw the structures and write the names of all possible structural isomers of the molecular formula

C_4H_9Br

.

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medium

Propose a reason why the Lassaigne's test for halogens might yield a misleading result if the organic compound is fused with an insufficient amount of sodium metal.

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medium

Explain the difference between a nucleophile and an electrophile. Provide one example for each.

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hard

Evaluate which of the following two species,

H_2N-CH=CH_2

(vinylamine) or

O_2N-CH=CH_2

(nitroethene), would have a longer C=C bond. Justify your reasoning based on resonance.

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hard

In an estimation of nitrogen by Dumas' method,

0.35

g of an organic compound gave

48.6

mL of nitrogen collected at

300

K and

758

mm Hg pressure. Calculate the percentage of nitrogen in the compound. (Aqueous tension at

300

K =

15

mm Hg).

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hard

Explain why benzene is represented as a resonance hybrid of two structures.

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hard

Evaluate the contributing resonance structures of phenoxide ion (

C_6H_5O^-

). Justify why electrophilic substitution is faster in phenol than in benzene.

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hard

You are given a mixture containing benzoic acid (acidic), aniline (basic), and naphthalene (neutral), all dissolved in ether. Design a detailed experimental procedure using differential extraction to separate these three components and recover them in their solid forms. Include all chemical reactions involved.

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hard

Summarize the test for nitrogen in an organic compound using the Lassaigne's test.

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hard

Explain the principle behind the qualitative detection of carbon and hydrogen in an organic compound. Write the chemical reactions involved.

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hard

An organic compound 'A', a naturally occurring amino acid, on analysis gave

40.4\%

carbon and

7.86\%

hydrogen. In a Kjeldahl's estimation,

0.89

g of 'A' liberated ammonia which completely neutralized

50

mL of

0.1

M

H_2SO_4

. The molecular mass of 'A' is found to be

89

g/mol. Propose the empirical and molecular formula of compound 'A' and create a valid structure for it.

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hard

In the Carius method for the estimation of sulfur,

0.233

g of an organic compound gave

0.466

g of barium sulphate (

BaSO_4

). In a separate experiment for halogen estimation,

0.188

g of the same compound gave

0.376

g of silver bromide (

AgBr

). Calculate the percentage of sulfur and bromine in the compound. (Atomic masses: S=32, Ba=137, O=16, Ag=108, Br=80)

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hard

Formulate all possible chain and position isomers for an alcohol with the molecular formula

C_4H_{10}O

. Classify each as primary, secondary, or tertiary.

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hard

Compare the relative acidities of ethanoic acid (

CH_3COOH

), fluoroethanoic acid (

FCH_2COOH

), and propanoic acid (

CH_3CH_2COOH

). Analyze the role of the inductive effect in your explanation.

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hard

Demonstrate the resonance structures for the phenoxide ion (

C_6H_5O^-

). Use curved arrows to show the delocalization of electrons. Analyze why the phenoxide ion is more stable than phenol.

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Organic Chemistry – Some Basic Principles and TechniquesClass 11 Chemistry Practice Questions