Predict whether the following molecules are iso-structural or not. Justify your answer.

(A) NMe$$_3$$

(B) N(SiMe$$_3$$)$$_3$$

Given : that $${\mu _{obs}} = \sum {{\mu _i}\,{x_i}} $$ where $${\mu _i}$$ is the dipole moment of stable conformer and $${x_i}$$ is the mole fraction of that conformer.

(A) Write stable conformer for Z-CH$$_2$$-CH$$_2$$-Z in Newman's projection.

If $${\mu _{solution}}$$ = 1.0 D and mole fraction of anti-form = 0.82, find $${\mu _{Gauche}}$$.

(B) Write most stable meso conformer of

If (i) Y = CH$$_3$$ about C$$_2$$ - C$$_3$$ rotation and (ii) Y = OH about C$$_1$$ - C$$_2$$ rotation.

Draw the structure of XeF₄ and OSF₄ according to VSEPR theory clearly indicating the state of hybridisation of the central atom and lone pair of electrons (if any) on the central atom.

Arrange the following :

In the decreasing order of the O - O bond length present in them

O₂, KO₂ and O₂[AsF₄]