Chapter Exam

Chapter 14: Haloalkanes and Haloarenes — Online MCQ Test

Q: Which of the following reagents is used in the Finkelstein reaction for the preparation of alkyl iodides?

Answer: A. NaI in dry acetone — Finkelstein reaction involves the exchange of halogen with iodine using sodium iodide in dry acetone.

Q: What is the hybridisation of the carbon atom bonded to the halogen in a haloalkane?

Answer: C. sp3 — In haloalkanes, the carbon atom attached to the halogen is saturated and thus sp3 hybridised.

Q: Which mechanism is followed by the reaction of tert-butyl bromide with aqueous KOH?

Answer: A. SN1 — Tertiary alkyl halides react via the SN1 mechanism due to the formation of a stable carbocation intermediate.

Q: Why are aryl halides less reactive towards nucleophilic substitution compared to alkyl halides?

Answer: A. Due to C-Cl bond resonance — Partial double bond character due to resonance makes the C-X bond in aryl halides stronger and harder to break.

Q: Which reagent is most effective for converting an alcohol into an alkyl chloride without retention of configuration?

Answer: D. SOCl2 without pyridine — SOCl2 alone provides alkyl chloride with inversion of configuration, whereas pyridine leads to retention.

CHEMISTRY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 14: Haloalkanes and Haloarenes with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th CHEMISTRY. This chapter covers: Focusing on organohalogen compounds this chapter details preparation physical properties and nucleophilic substitution mechanisms SN1 and SN2. Students study haloarene electrophili.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 14: Haloalkanes and Haloarenes — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th CHEMISTRY — Chapter 14: Haloalkanes and Haloarenes, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following reagents is used in the Finkelstein reaction for the preparation of alkyl iodides?

A. NaI in dry acetone ✓
B. AgF in water
C. KI in ethanol
D. NaCl in ether

Answer: A. NaI in dry acetone
Finkelstein reaction involves the exchange of halogen with iodine using sodium iodide in dry acetone.

What is the hybridisation of the carbon atom bonded to the halogen in a haloalkane?

A. sp
B. sp2
C. sp3 ✓
D. dsp2

Answer: C. sp3
In haloalkanes, the carbon atom attached to the halogen is saturated and thus sp3 hybridised.

Which mechanism is followed by the reaction of tert-butyl bromide with aqueous KOH?

A. SN1 ✓
B. SN2
C. E1
D. E2

Answer: A. SN1
Tertiary alkyl halides react via the SN1 mechanism due to the formation of a stable carbocation intermediate.

Why are aryl halides less reactive towards nucleophilic substitution compared to alkyl halides?

A. Due to C-Cl bond resonance ✓
B. Due to steric hindrance
C. Due to sp3 hybridization
D. Due to high electronegativity of carbon

Answer: A. Due to C-Cl bond resonance
Partial double bond character due to resonance makes the C-X bond in aryl halides stronger and harder to break.

Which reagent is most effective for converting an alcohol into an alkyl chloride without retention of configuration?