MHT CET · Chemistry · Haloalkanes and Haloarenes

Which among the following is true for Balz-Schiemann reaction?

A In this \(\mathrm{Ar}-\mathrm{Cl}\) is obtained from \(\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}\)
B It is useful for preparation of nitrobenzene from benzene diazonium salts
C In this Ar - CN is obtained from \(\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}\)
D In this \(\mathrm{Ar}-\mathrm{F}\) is obtained from \(\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}\)

Verified Solution

Answer & Solution

Correct Answer

(D) In this \(\mathrm{Ar}-\mathrm{F}\) is obtained from \(\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}\)

Step-by-step Solution

Detailed explanation

Balz-Schiemann Reaction:
When arene-diazonium chloride is prepared with fluoroboric acid, arene diazonium fluoroborate is precipitated and decomposes to yield aryl fluoride which on heating.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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