MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which among the following pairs of halogen forms the interhalogen compound of the type \(\mathrm{XX}_{7}^{\prime}\) ?

A Br and \(\mathrm{F}\)
B Cl and \(\mathrm{F}\)
C I and F
D I and Cl

Verified Solution

Answer & Solution

Correct Answer

(C) I and F

Step-by-step Solution

Detailed explanation

I and F
The interhalogen compound of type \(\mathrm{XX}_{7}^{\prime}\), iodine heptafluoride with the chemical formula \(\mathrm{IF}_{7}\), is made up of the halogen pairs iodine (I) and fluorine (F).
VSEPR theory predicts that it has an unusual pentagonal bipyramidal structure.

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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