Chapter Exam

Chapter 13: Hydrocarbons — Online MCQ Test

Q: Which of the following represents the general formula for acyclic alkanes?

Answer: B. CnH2n+2 — Acyclic alkanes are saturated hydrocarbons with the general molecular formula CnH2n+2.

Q: Which of the following rules governs the addition of unsymmetrical reagents to unsymmetrical alkenes?

Answer: B. Markovnikov's rule — Markovnikov's rule states that the negative part of the reagent adds to the carbon atom with fewer hydrogen atoms.

Q: Which reagent is used for the Wurtz reaction to prepare higher alkanes?

Answer: B. Na/Dry ether — Wurtz reaction involves the coupling of two alkyl halides in the presence of sodium metal and dry ether.

Q: Compare the reactivity of alkanes towards halogenation. Which is the correct order?

Answer: A. F2 > Cl2 > Br2 > I2 — Reactivity decreases as we move down the halogen group due to decreasing electronegativity and increasing bond dissociation energy.

Q: Identify the major product of the reaction between propene and HBr in the presence of benzoyl peroxide.

Answer: B. 1-bromopropane — In the presence of peroxide, HBr adds to alkenes via a free radical mechanism following anti-Markovnikov addition.

CHEMISTRY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 13: Hydrocarbons with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th CHEMISTRY. This chapter covers: This chapter covers alkanes alkenes alkynes and aromatic hydrocarbons synthesis properties and reactivity. Students study Markovnikov rule ozonolysis electrophilic substitution rea.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 13: Hydrocarbons — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th CHEMISTRY — Chapter 13: Hydrocarbons, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following represents the general formula for acyclic alkanes?

A. CnH2n
B. CnH2n+2 ✓
C. CnH2n-2
D. CnH2n-6

Answer: B. CnH2n+2
Acyclic alkanes are saturated hydrocarbons with the general molecular formula CnH2n+2.

Which of the following rules governs the addition of unsymmetrical reagents to unsymmetrical alkenes?

A. Huckel's rule
B. Markovnikov's rule ✓
C. Saytzeff rule
D. Pauli's exclusion principle

Answer: B. Markovnikov's rule
Markovnikov's rule states that the negative part of the reagent adds to the carbon atom with fewer hydrogen atoms.

Which reagent is used for the Wurtz reaction to prepare higher alkanes?

A. Zn/HCl
B. Na/Dry ether ✓
C. LiAlH4
D. Pd/C

Answer: B. Na/Dry ether
Wurtz reaction involves the coupling of two alkyl halides in the presence of sodium metal and dry ether.

Compare the reactivity of alkanes towards halogenation. Which is the correct order?

A. F2 > Cl2 > Br2 > I2 ✓
B. I2 > Br2 > Cl2 > F2
C. Cl2 > F2 > Br2 > I2
D. F2 > Br2 > Cl2 > I2

Answer: A. F2 > Cl2 > Br2 > I2
Reactivity decreases as we move down the halogen group due to decreasing electronegativity and increasing bond dissociation energy.

Identify the major product of the reaction between propene and HBr in the presence of benzoyl peroxide.