Higher the electronegativity difference between the two bonded atoms, higher will be the polarity of that bond.
Electronegativity values are,
C= 2.5
Si = 1.8
O = 3.5
N = 3.0
F = 4.0
S = 2.5
P = 2.1
C-Si Bond has the highest electronegativity difference , hence it will be most polar.
Answer = C-Si
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