Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET202521 Apr 2025Evening ShiftChemistryHaloalkanes and HaloarenesActual

What type of arenes are obtained when arene diazonium chloride is treated with fluoroboric acid and then heated further?

Options

  1. AAr - NO ₂
  2. BAr - F
  3. CAr - Cl
  4. DAr-H

Correct answer

B. Ar - F

Step-by-step solution

The reaction is the Balz-Schiemann reaction , which synthesizes fluoroarenes from arene diazonium salts. Arenediazonium fluoroborate forms when arenediazonium chloride ArN₂^+Cl^- reacts with fluoroboric acid HBF₄ : ArN₂^+Cl^- + HBF₄ ArN₂^+BF₄^- + HCl Thermal decomposition of arenediazonium fluoroborate produces fluoroarene ArF , nitrogen gas, and boron trifluoride: ArN₂^+BF₄^- heat ArF + N₂ + BF₃ The product is a fluoroarene ArF , corresponding to option B.

Practice Haloalkanes and Haloarenes on Quantrex Academy →

More from Haloalkanes and Haloarenes

With reference to the two statements Assertion and Reason, choose the correct option. Assertion: The order of reactivity towards S_N 1 reaction is: C₆ H₅- CH₂ Br > (CH₃ )₃- C - Br 2026What is the major product [Z] formed when compound [C] undergoes the following reactions: 2026Identify the compounds A and B from the following reaction sequence: 2026Identify the wrong statement from the following 2026Two statements, Assertion and Reason are given. With reference to them, choose the correct option. Assertion: Hydrolysis of 2-Bromo-2-methylpropane follows S_N1 mechanism which inv 2026Identify X, Y and Z. 2026Which one is an INCORRECT statement with regard to the following reaction? 2026The compound from which chlorobenzene cannot be prepared easily is 2026 Full Haloalkanes and Haloarenes list All MHT CET PYQs