MHT CET · Chemistry · s Block Elements

Which among the following halogens combines readily with metals to form metal halides with highest ionic character?

A Chlorine
B Bromine
C Iodine
D Fluorine

Verified Solution

Answer & Solution

Correct Answer

(D) Fluorine

Step-by-step Solution

Detailed explanation

Ionic character of metal halides decreases in the order \(\mathrm{MF}>\mathrm{MCl}>\mathrm{MBr}>\mathrm{MI}\), where, \(\mathrm{M}\) is a monovalent metal. Smaller the size of anion, greater is the ionic character (Fajan's rule). Therefore, fluorine forms metal halides with highest ionic character.

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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