Chapter Exam

Chapter 8: Organic Chemistry Some Basic Principles and Techniques — Online MCQ Test

Q: Which of the following is the correct IUPAC name for CH3CH2CH2OH?

Answer: B. Propan-1-ol — The longest chain has three carbon atoms and the hydroxyl group is on carbon 1, so the name is propan-1-ol.

Q: The functional group present in aldehydes is:

Answer: C. -CHO — Aldehydes contain the formyl group, written as -CHO.

Q: A compound with molecular formula C4H10 has how many structural isomers?

Answer: B. 2 — C4H10 has two structural isomers: n-butane and isobutane (2-methylpropane).

Q: Which carbocation is most stable?

Answer: D. (CH3)3C+ — Tertiary carbocations are most stable due to maximum hyperconjugation and electron donation by alkyl groups.

Q: Which of the following compounds will show the maximum number of isomers among the given molecular formulas?

Answer: C. C5H12 — Among these, C5H12 has the maximum number of structural isomers, which is three.

CHEMISTRY · Grade 11 · CBSE(NCERT)

Practice Chapter 8: Organic Chemistry Some Basic Principles and Techniques with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 CHEMISTRY. This chapter covers: IUPAC nomenclature Isomerism Functional group Homolytic cleavage Heterolytic cleavage Inductive effect Resonance Hyperconjugation Electrophile Nucleophile Carbocation Carbanion. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8: Organic Chemistry Some Basic Principles and Techniques — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 CHEMISTRY — Chapter 8: Organic Chemistry Some Basic Principles and Techniques, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the correct IUPAC name for CH3CH2CH2OH?

A. Methanol
B. Propan-1-ol ✓
C. Propan-2-ol
D. Ethoxy methane

Answer: B. Propan-1-ol
The longest chain has three carbon atoms and the hydroxyl group is on carbon 1, so the name is propan-1-ol.

The functional group present in aldehydes is:

A. -OH
B. -COOH
C. -CHO ✓
D. -O-

Answer: C. -CHO
Aldehydes contain the formyl group, written as -CHO.

A compound with molecular formula C4H10 has how many structural isomers?

A. 1
B. 2 ✓
C. 3
D. 4

Answer: B. 2
C4H10 has two structural isomers: n-butane and isobutane (2-methylpropane).

Which carbocation is most stable?

A. CH3+
B. CH3CH2+
C. (CH3)2CH+
D. (CH3)3C+ ✓

Answer: D. (CH3)3C+
Tertiary carbocations are most stable due to maximum hyperconjugation and electron donation by alkyl groups.

Which of the following compounds will show the maximum number of isomers among the given molecular formulas?

A. C3H8
B. C4H10
C. C5H12 ✓
D. C2H6

Answer: C. C5H12
Among these, C5H12 has the maximum number of structural isomers, which is three.

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