Question

which of the following exist as dimer
1)BrCl
2)ClF3
3)ICl3
4)IF3​

Answer 1

Answer:

CIF3

Explanation:

CIF3 exist as dimer

Chlorine has empty d-orbitals and it acquires excited state at the time of bonding when electron from 3p-orbital are promoted to 3d-orbital and thus can exhibit a covalency of three.

Fluorine cannot expand its octet due to the absence of empty d-orbitals in 2

nd

energy shell. Thus it cannot exhibit covalency more than 1.

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