Question

Consider IF3O2 (with I as the central atom) (6 pts).
(a) How many isomers are possible?
(b) Assign point group designations to each isomer.
(c) Which isomer is most likely based on repulsive effects and why?
(d) How many vibrational degrees of freedom are possible in IF3O2?

Answer 1

A 3 isomers are possible for IF3O2 as shown in figure

B In figure 1, the point group is C2V , In figure 2, the point group is Cs, In figure 3, the point group is D3h

C  Figure 2 is depending more on repulsive effect as two of the flourine is on plane while another is going inside whereas in figure 1 only two flourine present in close vicinity and figure 3 is least repulsive dependent as the adjacent florine are transverse to each other.

Thus, Figure 2 is depending more on repulsive effect

D For non linear,

Vibrational mode  $= 3 n – 6 = 3 (6) – 6 = 12$

Thus, 12 Vibrational mode are present.

Answer 2

Considering  $\bold{IF_3O_2}$ with I as the central atom

a. there are three isomers are possible for $\bold{IF_3O_2}$.

b. Point group designation for 1 isomer is $\bold{C_2_v}$, for isomer 2nd is $\bold{C_s}$ and for 3rd isomer is $\bold{D_3_h}$.

c. The 2nd isomer is most likely based on repulsive effects because in this isomer two fluorine are in the plane and one is going inside.

d. There are 12 vibrational degrees of freedom present in $\bold{IF_3O_2}$.

What are isomers?

Isomers have the same number of atoms are present and have the same empirical formula too, but they are different in the arrangements of their atoms.

There are three types of isomers present:

Chain isomers

Positional isomer

Functional isomer

Thus, a -three isomers, b -(1st isomer -$\bold{C_2_v}$), (2nd isomer -$\bold{C_s}$), (third isomer -$\bold{D_3_h}$), c -second isomer, d -12.

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