Two compounds  $P{X}_2{Y}_3$ and  $P{X}_3{Y}_2$. (Where P= phosphorous atom and  $X,Y$ = monovalent atoms) If all  X atoms replaced by  Z atoms and electro negativity order is  $X>Y>Z$. Then incorrect statement(s) is/are
i) The dipole moment of product obtained from  $P{X}_2{Y}_3$ is non zero
ii) The dipole moment of product obtained from  $P{X}_2{Y}_3$ is zero
iii) The dipole moment of product obtained from  $P{X}_3{Y}_2$ is zero
iv) The dipole moment of product obtained from  $P{X}_3{Y}_2$ is non zero

Given: Compounds: PX₂Y₃ and PX₃Y₂

All X atoms replaced by Z

Electronegativity: X > Y > Z

Step 1: Molecular Shapes

Phosphorus compounds with 5 ligands have trigonal bipyramidal geometry:

3 atoms in equatorial plane

2 atoms in axial positions

Step 2: Dipole Moments

PX₂Y₃ → PZ₂Y₃: asymmetric → net dipole ≠ 0 (Correct)

PX₃Y₂ → PZ₃Y₂: symmetric → net dipole = 0 (Correct)

Step 3: Match with Statements

i) Dipole of PX₂Y₃ product is non-zero - Correct

ii) Dipole of PX₂Y₃ product is zero - Incorrect

iii) Dipole of PX₃Y₂ product is zero - Correct

iv) Dipole of PX₃Y₂ product is non-zero - Incorrect

Answer (Incorrect statements): ii and iv

After replacing X by less electronegative Z, PX₂Y₃ becomes asymmetric → dipole ≠ 0; PX₃Y₂ remains symmetric → dipole = 0.