Question

Which following molecules expected to be polar? SiBr4 CO2 SO2 BF3

Answer 1

SiBr₄  - non polar

Explanation

electronegativity of Si is 1.8 and Br is 2.8 electronegativity diffrence is more so Si - Br bond is polar but structure of molecule is tetrahedral polar bond balance each other and molecule become non polar.

CO₂   - non polar

Explanation -

CO₂ is linear molecule and oxygen of each end is symetrical. polarity result from unequal sharing of valence electon because of this symetry there is no unequal sharing and molecule is non polar

SO₂  - Polar

Explanation -

molecule of SO₂ is not symmetrical it structure is bend. and electronegativity diffrence between S and O there is unequal sharing of valence elctron therefore molecule is polar.

BF₃   - non polar

Explanation -

BF₃ molecule has symmetrical trigonal planner geometry . resultant moment of any two B - F dipole is eqyal to magnitude but oppsite direction of third one, si ner dipole moment of BF₃ molecule is zero and molecule is nonpolar.