Question

please arrange the following in the order of increasing polarity P-H ,C-H , O-H?

Answer 1

Electronegativity of P=2.1 and of C = 2.5 and that of O is 3.5 and H has elctronegativity 2.2

greater will be the electronegativity difference and thus higher will be the polarity

Electronegativity difference between P and H is 0.1
Electronegativity difference between O and H is 1.3
Electronegativity difference between C and H is 0.3

Now we can conclude that
O-H > C-H > P-H