Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The correct answer is C.

A. SbH₃ (stibine) is a known hydride; Sb is in Group 15 like N and P and forms three bonds.

B. FXeOSO₂F is xenon(II) fluoride fluorosulfate, with Xe in the +2 state. Xenon forms compounds with highly electronegative groups, so it exists.

C. IBr₇ does not exist. Iodine reaches the +7 state only with the small, highly electronegative fluorine (IF₇); the larger Br atoms cannot stabilise iodine in +7.

D. HONO₂ is nitric acid, HNO₃, a common stable acid. Nitrogen has no d-orbitals and does not expand its octet; in HNO₃ it is N⁺ with three σ bonds and one π bond, a full octet. So HNO₃ exists.

Hence IBr₇ is the species that does not exist.