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** Q 2573156946. ** 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_text(Solution) = 1.0 D` and mole fraction of anti - form `= 0.82`, find `mu _(Gauche)`

(b) Write most stable meso conformer of.

`underset (underset text( CHDY) (|) ) CHDY`

If (i) `Y = CH_3` about `C_2- C_1` rotation and

(ii) `Y = OH` about `C_1 - C_2` rotation.

**JEE 2005 Mains **